CN112709638B - Fuel oil temperature adjusting system and method for high-low temperature starting test of engine - Google Patents
Fuel oil temperature adjusting system and method for high-low temperature starting test of engine Download PDFInfo
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- CN112709638B CN112709638B CN202011586131.4A CN202011586131A CN112709638B CN 112709638 B CN112709638 B CN 112709638B CN 202011586131 A CN202011586131 A CN 202011586131A CN 112709638 B CN112709638 B CN 112709638B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/10—Heating, e.g. warming-up before starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/232—Fuel valves; Draining valves or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a fuel temperature adjusting system and a fuel temperature adjusting method for a high-low temperature starting test of an engine, wherein an oil tank is arranged outside a test chamber, the volume of the oil tank is not limited by the volume of the test chamber any more, sufficient fuel can be stored to meet the continuous fuel supply requirement of the high-power engine high-low temperature starting test, the fuel temperature can be adjusted to the target temperature required by the test before the test by arranging an oil inlet electromagnetic valve and an oil return electromagnetic valve, the oil inlet electromagnetic valve is controlled to be opened and the oil return electromagnetic valve is controlled to be closed when the engine is started, the fuel meeting the temperature requirement can be supplied immediately, and a fuel temperature adjusting device can not only heat the fuel, but also cool the fuel, and can meet the temperature requirement of a fuel inlet in the whole test process when the high-low temperature starting test is carried out.
Description
Technical Field
The invention relates to the technical field of high and low temperature starting tests of aircraft engines, in particular to a fuel temperature adjusting system and method for the high and low temperature starting tests of engines.
Background
General aviation turbine turboprop and turboshaft engine specifications (GJB242A) stipulate that heat release and oil cooling tests are required before the engine initially flies, and high-temperature and low-temperature starting tests on sea level are required when the engine is designed and set. Specifically, the heat release and lubricating oil cooling tests of the engine need to be carried out in the environment states of static sea level, highest air inlet stagnation temperature of 1.2km, highest air inlet stagnation temperature of the maximum height and the like, and the fuel inlet temperature of the engine is required to be maintained at 57 +/-2 ℃ in the whole test process; and the high-temperature and low-temperature starting tests need to deliver the fuel with the highest temperature (usually 52 +/-2 ℃) and inlet air on the hot days at sea level after the holding time (high-temperature starting tests) or the fuel with the lowest temperature (usually-34 +/-2 ℃) and air at sea level (low-temperature starting tests) for testing. In order to meet the requirements of heat release, oil cooling and high and low temperature starting tests, the temperature of the fuel oil at the inlet of the engine supplied by the test bed is required to be in the range of minus 34 ℃ to 55 ℃, and the continuous oil supply capacity is met.
At present, the heat release and lubricating oil cooling test, the high-low temperature starting and the acceleration test of an aeroengine are generally completed on a starting rule test bed, and the starting rule test bed generally consists of an air supply system, a test cabin and an exhaust system. The air supply system provides high-temperature and low-temperature air to enter the test chamber through mixing of cold and hot air sources to supply to the tested engine, the tested engine is placed in the test chamber, the test chamber is of a closed structure, the test chamber is in a high-temperature environment during high-temperature test, the test chamber is in a low-temperature environment during low-temperature test, the exhaust system discharges the high-temperature and low-temperature air entering the test chamber, and the engine discharges high-temperature gas discharged by the engine after being cooled during test. The existing high-temperature and low-temperature fuel oil implementation mode of the starting rule test bed mainly comprises the steps that an oil tank is placed in a test cabin, fuel oil with a certain volume is stored in the oil tank, or the length of a fuel oil pipeline in the test cabin is lengthened, high-temperature and low-temperature air exists in the test cabin, and the fuel oil in the oil tank or the pipeline is subjected to heat exchange with the air in the test cabin to obtain the high-temperature and low-temperature fuel oil. When heat release and lubricating oil cooling tests are carried out, because the test time is long and the required high-temperature fuel flow is large, an online heater is usually connected in series in a fuel pipeline to heat the fuel.
For example, patent CN203978669U discloses a conical fuel tank, which includes a bottom or a surface, the bottom and the surface form a closed container, the bottom is of a conical structure, a conical tip of the bottom is directed to an air inlet of a test chamber, the air flow at the air inlet is large and fast, and after contacting the conical tip of the bottom, the air flows along the surface of the bottom after being split and exchanges heat with the conical fuel tank, so that the temperature of the conical fuel is faster to be consistent with that of the test chamber, and the conical fuel tank is cooled or heated by the air flow. Patent CN201610022516.5 discloses an aircraft engine fuel heating test method and test device for carrying out heating test control on fuel of an external fuel system for supplying fuel to an aircraft engine, wherein the fuel heating test method comprises the following steps: receiving a preset temperature value required by fuel oil heating, and acquiring and receiving an inlet fuel oil temperature value of an external fuel oil system at an inlet of a heating device; acquiring and receiving the fuel flow of an aircraft engine in real time; and calculating the heating power value of the heating device according to the difference value between the inlet fuel temperature value and the preset temperature value and the fuel flow, and adjusting the output heating power of the heating device according to the calculated heating power value.
However, because the equipment such as the tested engine, the engine pedestal, the power absorption and measurement device, the exhaust injection cylinder and the like need to be arranged in the test chamber, if an oil tank is arranged in the test chamber, the size of the oil tank is limited, so that more fuel oil is difficult to store, and the continuous oil supply requirement during the test of the high-power aircraft engine cannot be met. In addition, an online heater is directly connected in series to an oil supply pipeline, the fuel flow is completely determined by the tested engine, when the engine does not work, the heater does not heat, the fuel flow is generated after the engine runs, the engine can be heated by the heater, the normal-temperature fuel can be heated to the specified temperature within a long time, the high-low temperature fuel is required to be imported during the starting of a high-low temperature starting test, and the existing test bed is generally provided with a fuel heating device, so that no test equipment for cooling the fuel is available temporarily.
Disclosure of Invention
The invention provides a fuel temperature adjusting system and method for a high-low temperature starting test of an engine, which aim to solve the technical problems that the high-low temperature starting test of the conventional aircraft engine cannot meet the continuous fuel supply requirement and cannot immediately provide fuel with target temperature when the high-low temperature starting test is started because the high-low temperature starting test is carried out on a starting rule test bed.
According to one aspect of the present invention, there is provided a fuel temperature regulation system for an engine high and low temperature start test, comprising:
the fuel tank is arranged outside the test cabin, is connected with a tested engine in the test cabin through an oil inlet pipeline and is used for storing fuel oil quantity required by a high-low temperature starting test of the engine;
the fuel pump is arranged on the oil inlet pipeline and is used for pressurizing and conveying the fuel stored in the fuel tank;
the fuel temperature adjusting device is arranged on the oil inlet pipeline and behind the fuel pump and is used for adjusting the temperature of the fuel;
the oil inlet electromagnetic valve is arranged at an inlet of the tested engine and used for controlling whether fuel oil is supplied to the tested engine or not;
the oil return electromagnetic valve is arranged on an oil return pipeline of the oil tank and used for controlling the on-off of the oil return pipeline;
the temperature sensor is arranged on the oil inlet pipeline or the oil return pipeline and used for detecting the temperature of the fuel oil;
control system, respectively with fuel pump, fuel temperature adjusting device, oil feed solenoid valve, oil return solenoid valve and temperature sensor link to each other for according to temperature sensor's testing result control fuel temperature adjusting device's operating condition is in order to adjust the fuel temperature to the target temperature, and when temperature sensor detected the fuel temperature and reached the target temperature, control oil feed solenoid valve and open and control the oil return solenoid valve and close, otherwise control oil feed solenoid valve and close and control the oil return solenoid valve and open.
Further, the fuel temperature adjusting device comprises a three-way adjusting valve, a heater, a plate heat exchanger and a mixer, wherein the inlet of the three-way adjusting valve is connected with the outlet of the fuel pump, a first outlet of the plate heat exchanger is connected with an inlet of the heater, a second outlet of the plate heat exchanger is connected with an inlet of the plate heat exchanger, the refrigerant inlet of the plate heat exchanger is connected with an external refrigerating unit, the heater and the outlet of the plate heat exchanger are both connected with the mixer, the heater is used for heating the passing fuel oil, the plate heat exchanger is used for cooling the passing fuel oil, the mixer is used for mixing two fuel oil streams, the control system is respectively connected with the heater and the external refrigerating unit, and the control device is used for controlling the working states of the heater and the external refrigerating unit so as to adjust the temperature of the blended fuel oil to a target temperature.
Furthermore, the control system is also connected with the three-way regulating valve and used for regulating the fuel oil amount of the heating oil path and the cooling oil path.
Further, when the temperature sensor detects that the temperature of the fuel is higher than the target temperature, the control system controls the heater to be out of work, normal-temperature fuel circulates in the heating oil path, the external refrigerating unit is controlled to start working, the plate heat exchanger cools the flowing fuel, the low-temperature fuel and the normal-temperature fuel are mixed in the mixer, and the fuel amount of the two oil paths is adjusted by controlling the three-way adjusting valve so that the outlet oil temperature is quickly cooled to the target temperature;
when the temperature sensor detects that the temperature of the fuel is lower than the target temperature, the control system controls the heater to start working, the fuel flowing through the heater is heated, the external refrigerating unit is controlled not to work, the normal-temperature fuel flows in the cooling oil way, the high-temperature fuel and the normal-temperature fuel are mixed in the mixer, and the fuel amount of the two oil ways is adjusted by controlling the three-way adjusting valve so that the outlet oil temperature is quickly raised to the target temperature.
Furthermore, the oil tank is connected with an oil depot through an oil supplementing pipeline, an oil supplementing electromagnetic valve is arranged on the oil supplementing pipeline and connected with the control system, and the control system is further used for controlling the oil supplementing electromagnetic valve to be opened to supplement fuel oil into the oil tank when the fuel oil quantity in the oil tank is insufficient.
The fuel pump system further comprises a flow measuring device connected with the control system, the flow measuring device is arranged on the oil inlet pipeline and located behind the fuel pump and used for measuring the delivered fuel quantity, and the control system is used for adjusting the opening degree of the fuel pump according to the required flow of the engine and the actual fuel quantity detected by the flow measuring device.
Further, the fuel temperature adjusting device is a movable online heating and cooling device.
In addition, the invention also provides a fuel temperature adjusting method for the high-low temperature starting test of the engine, which adopts the fuel temperature adjusting system and comprises the following steps:
step S1: detecting the fuel temperature in real time;
step S2: and controlling the working state of the fuel temperature adjusting device according to the detected fuel temperature so as to adjust the fuel temperature to a target temperature, and controlling the oil inlet electromagnetic valve to be opened and the oil return electromagnetic valve to be closed when the detected fuel temperature reaches the target temperature and is kept stable.
Further, the process of controlling the operating state of the fuel temperature adjusting device according to the detected fuel temperature to adjust the fuel temperature to the target temperature in step S2 specifically includes the following steps:
when the temperature of the fuel oil is detected to be higher than the target temperature, the heater is controlled not to work, the normal-temperature fuel oil flows in the heating oil way, the external refrigerating unit is controlled to start working, the plate heat exchanger cools the flowing fuel oil, the low-temperature fuel oil and the normal-temperature fuel oil are mixed in the mixer, and the fuel oil amount of the two oil ways is adjusted by controlling the three-way regulating valve so that the outlet oil temperature is quickly cooled to the target temperature;
when the temperature of the fuel oil is detected to be lower than the target temperature, the heater is controlled to start to work, the flowing fuel oil is heated, the external refrigerating unit is controlled not to work, the normal-temperature fuel oil flows in the cooling oil way, the high-temperature fuel oil and the normal-temperature fuel oil are mixed in the mixer, and the fuel oil amount of the two oil ways is adjusted by controlling the three-way adjusting valve so that the outlet oil temperature is quickly raised to the target temperature.
Further, the method also comprises the following steps:
step S3: and detecting the fuel quantity in the fuel tank, and controlling the fuel replenishing electromagnetic valve to be opened to replenish fuel into the fuel tank when the fuel quantity in the fuel tank is insufficient.
The invention has the following effects:
according to the fuel temperature adjusting system for the high and low temperature starting test of the engine, the fuel tank is arranged outside the test cabin, the volume of the fuel tank is not limited by the volume of the test cabin any more, sufficient fuel can be stored to meet the continuous fuel supply requirement of the high and low temperature starting test of a high-power engine, the fuel temperature can be adjusted to the target temperature required by the test before the test through the arrangement of the fuel inlet electromagnetic valve and the fuel return electromagnetic valve, the fuel inlet electromagnetic valve is controlled to be opened and the fuel return electromagnetic valve is controlled to be closed when the engine is started, the fuel meeting the temperature requirement can be supplied immediately, the fuel temperature adjusting device can heat the fuel and can cool the fuel, and the temperature requirement of a fuel inlet in the whole test process during the high and low temperature starting test can be met.
In addition, the fuel temperature adjusting method for the engine high-temperature and low-temperature starting test has the advantages.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a fuel temperature regulation system for an engine high and low temperature start test according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural view of a fuel temperature adjusting apparatus according to a preferred embodiment of the present invention.
Fig. 3 is a schematic flow chart of a fuel temperature adjusting method for an engine high-low temperature start test according to another embodiment of the invention.
Fig. 4 is a schematic flow chart of another embodiment of a fuel temperature adjustment method for an engine high and low temperature start test according to another embodiment of the present invention.
Description of the reference numerals
1. An oil tank; 2. a fuel pump; 3. a flow measuring device; 4. a fuel temperature adjusting device; 5. an oil inlet electromagnetic valve; 6. an oil return electromagnetic valve; 7. a temperature sensor; 8. an oil supplementing electromagnetic valve; 41. a three-way regulating valve; 42. a heater; 43. a plate heat exchanger; 44. a mixer.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
As shown in fig. 1, a preferred embodiment of the present invention provides a fuel temperature regulation system for an engine high and low temperature start test, comprising:
the fuel tank 1 is arranged outside the test cabin, is connected with a tested engine in the test cabin through a fuel inlet pipeline, and is used for storing fuel quantity required by a high-low temperature starting test of the engine;
the fuel pump 2 is arranged on the oil inlet pipeline and used for pressurizing and conveying the fuel stored in the oil tank 1;
the fuel temperature adjusting device 4 is arranged on the oil inlet pipeline and behind the fuel pump 2 and is used for adjusting the temperature of the fuel;
the oil inlet electromagnetic valve 5 is arranged at an inlet of the tested engine and used for controlling whether fuel oil is supplied to the tested engine or not;
the oil return electromagnetic valve 6 is arranged on an oil return pipeline of the oil tank 1 and used for controlling the on-off of the oil return pipeline;
the temperature sensor 7 is arranged on the oil inlet pipeline or the oil return pipeline and used for detecting the temperature of fuel oil;
control system, respectively with fuel pump 2, fuel temperature adjusting device 4, oil feed solenoid valve 5, oil return solenoid valve 6 and temperature sensor 7 link to each other, be used for the basis according to temperature sensor 7's testing result control the operating condition of fuel temperature adjusting device 4 is in order to adjust the fuel temperature to the target temperature, and when temperature sensor 7 detected the fuel temperature and reached the target temperature, control oil feed solenoid valve 5 and open and control oil return solenoid valve 6 and close, otherwise control oil feed solenoid valve 5 and close and control oil return solenoid valve 6 and open.
It can be understood that, the fuel temperature adjusting system for the high and low temperature starting test of the engine of the embodiment, the fuel tank 1 is arranged outside the test chamber, the volume of the fuel tank 1 is not limited by the volume of the test chamber any more, sufficient fuel can be stored to meet the continuous fuel supply requirement of the high and low temperature starting test of the high-power engine, the fuel temperature can be adjusted to the target temperature required by the test before the test by arranging the fuel inlet electromagnetic valve 5 and the oil return electromagnetic valve 6, the fuel meeting the temperature requirement can be supplied immediately by controlling the fuel inlet electromagnetic valve 5 to be opened and controlling the oil return electromagnetic valve 6 to be closed when the engine is started, and the fuel temperature adjusting device 4 can not only heat the fuel, but also cool the fuel, and can meet the temperature requirement of the fuel inlet in the whole test process when the high and low temperature starting test is carried out.
It can be understood that the fuel temperature regulating system further comprises a flow measuring device 3 connected with the control system, arranged on the fuel inlet pipeline and behind the fuel pump 2 and used for measuring the delivered fuel quantity, and the control system is used for regulating the opening degree of the fuel pump 2 according to the required flow of the engine and the actual fuel quantity detected by the flow measuring device 3 so as to provide the adaptive fuel quantity to the tested engine according to the test requirement. The fuel tank 1, the fuel pump 2 and the flow measuring device 3 are formed by a conventional test bed fuel system, and the cost is reduced by utilizing the equipment of the conventional test bed.
In addition, the fuel temperature adjusting device 4 is a movable on-line heating and cooling device and can be directly connected to a fuel supply pipeline of the existing engine test bed. The fuel temperature adjusting device 4 is instant heating type, after the fuel temperature adjusting device is connected in series with a main fuel inlet loop of a fuel system of an engine test bed, fuel with a certain flow passes through the fuel temperature adjusting device 4 and is heated or cooled to a target temperature according to a set target temperature, the flow of the fuel is determined according to the actual flow of the engine, and the fuel temperature adjusting device 4 has the capability of heating imported fuel to an outlet temperature of more than 52 ℃ or cooling to a temperature of less than-34 ℃.
Considering that the precision of the fuel temperature required in the engine test is +/-2 ℃, the fuel flow is greatly changed in the test, and the precision requirement of the fuel is difficult to meet after the fuel is directly heated or cooled from dozens of kilograms per hour of a slow vehicle to thousands of kilograms per hour of a take-off state, the invention carries out further optimization design on the fuel temperature regulating device 4. Specifically, as shown in fig. 2, the fuel temperature adjusting device 4 includes a three-way adjusting valve 41, a heater 42, a plate heat exchanger 43, and a mixer 44, an inlet of the three-way adjusting valve 41 is connected to an outlet of the fuel pump 2, a first outlet thereof is connected to an inlet of said heater 42, a second outlet thereof is connected to an inlet of said plate heat exchanger 43, the refrigerant inlet of the plate heat exchanger 43 is connected with an external refrigerating unit, the heater 42 and the outlet of the plate heat exchanger 43 are both connected with the mixer 44, the heater 42 is used for heating the passing fuel oil, the plate heat exchanger 43 is used for cooling the passing fuel oil, the mixer 44 is used to blend two streams of fuel, the control system is connected to the heater 42 and the external refrigeration unit, for controlling the operating conditions of the heater 42 and the external refrigeration unit to adjust the temperature of the blended fuel to a target temperature. After the fuel oil passes through the three-way regulating valve 41, the oil path is divided into two parts, one part is heated through the heater 42, the other part is cooled through the plate heat exchanger 43, the heated fuel oil and the cooled fuel oil are converged into the mixer 44, the two parts of fuel oil with different temperatures are mixed, the temperature of the fuel oil is quickly regulated to a target temperature and then supplied to an engine, the control precision of the fuel oil can be improved through fuel oil mixing, and the requirement of the control precision of the quickly changed fuel oil flow and temperature can be met.
Preferably, the control system is further connected to the three-way regulating valve 41 and is used for regulating the fuel amount of the heating oil path and the cooling oil path, and the blended fuel temperature can be quickly and accurately controlled by regulating the heated fuel flow and the cooled fuel flow, so that the regulation speed is higher, and the control accuracy is higher.
The temperature sensor 7 can be arranged on an oil inlet pipeline or an oil return pipeline, and preferably, the temperature sensor 7 is arranged at an inlet of a tested engine and is positioned in front of the oil inlet electromagnetic valve 5, so that the fuel temperature at the inlet can be detected in real time. When the temperature sensor 7 detects that the temperature of the fuel is higher than the target temperature, the fuel needs to be cooled, the control system controls the heater 42 to be out of work, the fuel which flows through the heating oil way is normal-temperature fuel, and controls the external refrigerating unit to start working, the plate heat exchanger 43 cools the flowing fuel, the low-temperature fuel and the normal-temperature fuel are mixed in the mixer 44, and then the three-way regulating valve 41 is controlled to regulate the fuel amount of the two oil ways so as to rapidly cool the outlet oil temperature to the target temperature. When the temperature sensor 7 detects that the temperature of the fuel is lower than the target temperature, the fuel needs to be heated, the control system controls the heater 42 to start working, the fuel flowing through the heater and controls the external refrigerating unit to not work, normal-temperature fuel flows in the cooling oil path, the high-temperature fuel and the normal-temperature fuel are mixed in the mixer 44, and the fuel amount of the two oil paths is adjusted by controlling the three-way adjusting valve 41 so that the outlet oil temperature is quickly heated to the target temperature.
In addition, the oil tank 1 is further connected with an oil depot through an oil supplementing pipeline, an oil supplementing electromagnetic valve 8 is arranged on the oil supplementing pipeline, the oil supplementing electromagnetic valve 8 is connected with the control system, and the control system is further used for controlling the oil supplementing electromagnetic valve 8 to be opened to supplement fuel oil into the oil tank 1 when the fuel oil quantity in the oil tank 1 is insufficient. Preferably, a liquid level sensor connected with a control system is arranged in the oil tank 1, when the liquid level sensor detects that the amount of fuel in the oil tank 1 is lower than a lower threshold, the control system controls the oil supplementing electromagnetic valve 8 to be opened to start oil supplementation, and when the liquid level sensor detects that the amount of fuel in the oil tank 1 exceeds an upper threshold, the control system controls the oil supplementing electromagnetic valve 8 to be closed to stop oil supplementation. The automatic control of oil supplement is realized through liquid level detection without human intervention.
If the fuel temperature adjusting device 4 is started when the engine is started, the fuel temperature adjusting device 4 needs to be preheated, the fuel flow of the engine is small in the starting process and the slow running process, the heat dissipation of a pipeline is large, the temperature of imported fuel can be heated or cooled to the specified temperature within a long time, the invalid running time of the engine is prolonged, the service life of the engine is prolonged while the test cost is improved, the test cost of the engine is far higher than the running cost of a vehicle platform device, and the requirement of the temperature of the imported fuel in the starting process of the engine cannot be met. Therefore, the oil inlet electromagnetic valve 5 and the oil return electromagnetic valve 6 are arranged at the position close to the fuel inlet of the engine, the fuel temperature adjusting device 4 is started before the test, the fuel in the fuel tank 1 flows to the tested engine after being heated or cooled by the fuel temperature adjusting device 4, the oil inlet electromagnetic valve 5 is closed, the oil return electromagnetic valve 6 is opened, the heated or cooled fuel flows back to the fuel tank 1 through the oil return pipeline, and the circulation is carried out, so that when the temperature at the position of the fuel inlet of the engine meets the requirement, the fuel temperature adjusting device 4 reaches the working stable state. When a high-low temperature starting test is formally started, the oil inlet electromagnetic valve 5 is controlled to be opened, the oil return electromagnetic valve 6 is controlled to be closed, fuel oil directly flows to the tested engine, and the oil inlet electromagnetic valve 5 and the oil return electromagnetic valve 6 are linked with an engine starting switch. Under the general condition, the fuel in the fuel tank 1 can meet the requirement of a single high-low temperature starting test, if the fuel is insufficient, the fuel supplementing electromagnetic valve 8 is automatically opened, the fuel coming from the fuel depot enters the fuel tank 1, and then the fuel is heated or cooled to the target temperature by the online fuel temperature adjusting device 4 to be supplied to the tested engine.
In addition, as shown in fig. 3, the invention also provides a fuel temperature adjusting method for an engine high and low temperature starting test, preferably adopting the fuel temperature adjusting system, comprising the following steps:
step S1: detecting the fuel temperature in real time;
step S2: and controlling the working state of the fuel temperature adjusting device 4 according to the detected fuel temperature to adjust the fuel temperature to the target temperature, and controlling the oil inlet electromagnetic valve 5 to be opened and the oil return electromagnetic valve 6 to be closed when the detected fuel temperature reaches the target temperature and is kept stable.
The fuel temperature adjusting method for the high and low temperature starting test of the engine can adjust the fuel temperature to the target temperature required by the test before the test, control the oil inlet electromagnetic valve 5 to be opened and control the oil return electromagnetic valve 6 to be closed when the engine is started, namely, the fuel meeting the temperature requirement can be supplied immediately, and the fuel temperature adjusting device 4 can not only heat the fuel, but also cool the fuel, so that the temperature requirement of a fuel inlet in the whole test process during the high and low temperature starting test can be met.
In addition, the process of controlling the operating state of the fuel temperature adjusting device 4 according to the detected fuel temperature to adjust the fuel temperature to the target temperature in step S2 specifically includes the following:
when the temperature of the fuel oil is detected to be higher than the target temperature, the heater 42 is controlled not to work, the normal-temperature fuel oil which flows in the oil way is heated, the external refrigerating unit is controlled to start working, the plate heat exchanger 43 cools the flowing fuel oil, the low-temperature fuel oil and the normal-temperature fuel oil are mixed in the mixer 44, and the fuel oil amount of the two oil ways is adjusted by controlling the three-way adjusting valve 41 so that the outlet oil temperature is quickly cooled to the target temperature;
when the temperature of the fuel oil is detected to be lower than the target temperature, the heater 42 is controlled to start working, the flowing fuel oil is heated, the external refrigerating unit is controlled not to work, the normal-temperature fuel oil flows in the cooling oil circuit, the high-temperature fuel oil and the normal-temperature fuel oil are mixed in the mixer 44, and the fuel oil amount of the two oil circuits is adjusted by controlling the three-way adjusting valve 41 so that the outlet oil temperature is quickly raised to the target temperature.
In addition, as shown in fig. 4, the fuel temperature adjusting method for the engine high and low temperature start test further includes the steps of:
step S3: the amount of fuel in the fuel tank 1 is detected, and the fuel replenishment solenoid valve 8 is controlled to open to replenish the fuel in the fuel tank 1 when the amount of fuel in the fuel tank 1 is insufficient.
Further, the step S3 further includes the following steps: and when the fuel quantity in the fuel tank 1 exceeds the upper limit threshold value, the fuel supplementing electromagnetic valve 8 is controlled to be closed, and the fuel is stopped being supplemented into the fuel tank 1.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A fuel temperature regulation system for an engine high and low temperature start test, comprising:
the fuel tank (1) is arranged outside the test cabin, is connected with a tested engine in the test cabin through a fuel inlet pipeline and is used for storing fuel quantity required by a high-low temperature starting test of the engine;
the fuel pump (2) is arranged on the oil inlet pipeline and is used for pressurizing and conveying the fuel stored in the oil tank (1);
the fuel temperature adjusting device (4) is arranged on the oil inlet pipeline and behind the fuel pump (2) and is used for adjusting the temperature of the fuel;
the oil inlet electromagnetic valve (5) is arranged at an inlet of the tested engine and used for controlling whether fuel oil is supplied to the tested engine or not;
the oil return electromagnetic valve (6) is arranged on an oil return pipeline of the oil tank (1) and is used for controlling the on-off of the oil return pipeline;
the temperature sensor (7) is arranged on the oil inlet pipeline or the oil return pipeline and is used for detecting the temperature of fuel oil;
the control system is respectively connected with the fuel pump (2), the fuel temperature adjusting device (4), the fuel inlet electromagnetic valve (5), the oil return electromagnetic valve (6) and the temperature sensor (7) and used for controlling the working state of the fuel temperature adjusting device (4) according to the detection result of the temperature sensor (7) so as to adjust the fuel temperature to the target temperature, controlling the fuel inlet electromagnetic valve (5) to be opened and controlling the oil return electromagnetic valve (6) to be closed when the temperature sensor (7) detects that the fuel temperature reaches the target temperature, and otherwise controlling the fuel inlet electromagnetic valve (5) to be closed and controlling the oil return electromagnetic valve (6) to be opened;
the fuel temperature adjusting device (4) comprises a three-way adjusting valve (41), a heater (42), a plate heat exchanger (43) and a mixer (44), wherein an inlet of the three-way adjusting valve (41) is connected with an outlet of the fuel pump (2), a first outlet of the three-way adjusting valve is connected with an inlet of the heater (42), a second outlet of the three-way adjusting valve is connected with an inlet of the plate heat exchanger (43), a refrigerant inlet of the plate heat exchanger (43) is connected with an external refrigerating unit, outlets of the heater (42) and the plate heat exchanger (43) are connected with the mixer (44), the heater (42) is used for heating passing fuel, the plate heat exchanger (43) is used for cooling the passing fuel, the mixer (44) is used for mixing two streams of fuel, and the control system is respectively connected with the heater (42) and the external refrigerating unit, for controlling the operating conditions of the heater (42) and the external refrigeration unit to adjust the temperature of the blended fuel to a target temperature.
2. The fuel temperature regulation system for an engine high and low temperature start test according to claim 1,
and the control system is also connected with the three-way regulating valve (41) and is used for regulating the fuel oil amount of the heating oil path and the cooling oil path.
3. The fuel temperature regulation system for an engine high and low temperature start test according to claim 2,
when the temperature sensor (7) detects that the temperature of the fuel oil is higher than the target temperature, the control system controls the heater (42) not to work, the fuel oil which flows in the heating oil way is normal-temperature fuel oil, and controls the external refrigerating unit to start working, the plate heat exchanger (43) cools the flowing fuel oil, the low-temperature fuel oil and the normal-temperature fuel oil are mixed in the mixer (44), and the fuel oil amount of the two oil ways is adjusted by controlling the three-way adjusting valve (41) so that the outlet oil temperature is quickly cooled to the target temperature;
when the temperature sensor (7) detects that the temperature of the fuel is lower than the target temperature, the control system controls the heater (42) to start working, the fuel flowing through is heated, the external refrigerating unit is controlled not to work, the normal-temperature fuel flows in the cooling oil way, the high-temperature fuel and the normal-temperature fuel are mixed in the mixer (44), and the fuel amount of the two oil ways is adjusted by controlling the three-way adjusting valve (41) so that the outlet oil temperature is quickly increased to the target temperature.
4. The fuel temperature regulation system for an engine high and low temperature start test according to claim 1,
the oil tank (1) is further connected with an oil depot through an oil supplementing pipeline, an oil supplementing electromagnetic valve (8) is arranged on the oil supplementing pipeline, the oil supplementing electromagnetic valve (8) is connected with the control system, and the control system is further used for controlling the oil supplementing electromagnetic valve (8) to be opened to supplement fuel oil in the oil tank (1) when the fuel oil amount in the oil tank (1) is insufficient.
5. The fuel temperature regulation system for an engine high and low temperature start test according to claim 1,
the fuel pump system is characterized by further comprising a flow measuring device (3) connected with the control system, the flow measuring device is arranged on an oil inlet pipeline and behind the fuel pump (2) and used for measuring the delivered fuel quantity, and the control system is used for adjusting the opening degree of the fuel pump (2) according to the required flow of an engine and the actual fuel quantity detected by the flow measuring device (3).
6. The fuel temperature regulation system for an engine high and low temperature start test according to claim 1,
the fuel temperature adjusting device (4) is a movable online heating and cooling device.
7. A fuel temperature adjusting method for an engine high and low temperature starting test adopts the fuel temperature adjusting system as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:
step S1: detecting the fuel temperature in real time;
step S2: and controlling the working state of the fuel temperature adjusting device (4) according to the detected fuel temperature so as to adjust the fuel temperature to a target temperature, and controlling the oil inlet electromagnetic valve (5) to be opened and the oil return electromagnetic valve (6) to be closed when the detected fuel temperature reaches the target temperature and is kept stable.
8. The fuel temperature adjusting method for an engine high and low temperature start test according to claim 7,
the process of controlling the operating state of the fuel temperature adjusting device (4) according to the detected fuel temperature to adjust the fuel temperature to the target temperature in step S2 specifically includes the following:
when the temperature of the fuel oil is detected to be higher than the target temperature, the heater (42) is controlled not to work, the normal-temperature fuel oil which flows in the oil way is heated, the external refrigerating unit is controlled to start working, the plate-type heat exchanger (43) cools the flowing fuel oil, the low-temperature fuel oil and the normal-temperature fuel oil are mixed in the mixer (44), and the fuel oil amount of the two oil ways is adjusted by controlling the three-way adjusting valve (41) so that the outlet oil temperature is quickly cooled to the target temperature;
when the temperature of the fuel oil is detected to be lower than the target temperature, the heater (42) is controlled to start working, the flowing fuel oil is heated, the external refrigerating unit is controlled not to work, the normal-temperature fuel oil flows in the cooling oil way, the high-temperature fuel oil and the normal-temperature fuel oil are mixed in the mixer (44), and the fuel oil amount of the two oil ways is adjusted by controlling the three-way adjusting valve (41) so that the outlet oil temperature is quickly increased to the target temperature.
9. The fuel temperature adjusting method for an engine high and low temperature start test according to claim 7,
further comprising the steps of:
step S3: the fuel quantity in the fuel tank (1) is detected, and the fuel replenishing electromagnetic valve (8) is controlled to be opened to replenish fuel into the fuel tank (1) when the fuel quantity in the fuel tank (1) is insufficient.
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| CN113929049A (en) * | 2021-10-21 | 2022-01-14 | 中船动力研究院有限公司 | Lubricating oil or fuel oil heating system utilizing waste heat of diesel engine exhaust gas |
| CN113898504A (en) * | 2021-11-16 | 2022-01-07 | 襄阳康劲动力科技有限公司 | Engine fuel temperature pressure control system |
| CN114294126B (en) * | 2021-12-21 | 2023-03-17 | 上海空间推进研究所 | Lean mode ignition starting system and method for airplane gas generation subsystem in low-temperature environment |
| CN114517719B (en) * | 2022-01-18 | 2023-01-24 | 东风汽车集团股份有限公司 | Engine oil pressure test method |
| CN115219215B (en) * | 2022-08-31 | 2023-03-24 | 中国航发四川燃气涡轮研究院 | Engine cold-dipping method for low-temperature starting test of turbofan engine |
| CN115219206B (en) * | 2022-08-31 | 2023-02-17 | 中国航发四川燃气涡轮研究院 | Engine cold and hot dipping system for high and low temperature starting test of aircraft engine |
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| CN205400906U (en) * | 2016-02-18 | 2016-07-27 | 江西洪都航空工业集团有限责任公司 | Aircraft engines starts oil supply unit in advance |
| CN206917766U (en) * | 2017-07-17 | 2018-01-23 | 上海同圆发动机测试设备有限公司 | The engine fuel thermostat controlled using dual-stage servo system |
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