CN114486271A - Two-stage sequential supercharging system foundation module test platform and test method - Google Patents
Two-stage sequential supercharging system foundation module test platform and test method Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 57
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- 239000002737 fuel gas Substances 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims description 69
- 239000010687 lubricating oil Substances 0.000 claims description 33
- 239000003921 oil Substances 0.000 claims description 22
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Abstract
The invention discloses a two-stage sequential supercharging system basic module test platform and a test method. The high-pressure stage variable geometry turbine and the low-pressure stage variable geometry turbine are connected in series, the low-pressure stage variable geometry turbine and the high-pressure stage variable geometry turbine are connected in series, an intercooler is connected between the low-pressure stage compressor and the high-pressure stage compressor in series, an inlet of the high-pressure stage variable geometry turbine is connected with an outlet of a fuel gas generating system, an outlet of the high-pressure stage compressor is connected with a main air branch and an auxiliary air branch, the main air branch is connected to an air inlet of the fuel gas generating system, the auxiliary air branch is connected to a fuel gas outlet of the fuel gas generating system, a fuel gas bypass branch is connected between a fuel gas inlet pipeline of the high-pressure stage variable geometry turbine and a fuel gas outlet pipeline of the high-pressure stage variable geometry turbine, and a sequential switching valve, a flowmeter V4 and a fuel gas bypass valve are arranged on the fuel gas bypass branch.
Description
Technical Field
The invention relates to the technical field of turbochargers, in particular to a basic module test platform and a test method for a two-stage sequential supercharging system.
Background
With the development of the diesel engine technology towards high supercharging, the diesel engine system has been researched by a two-stage sequential supercharger system matching technology, and the two-stage sequential supercharging system adopts key matching parts such as a turbocharger, an intercooler, a switching valve, an air bypass valve, a gas bypass valve and the like, so that the performance and the reliability of the two-stage sequential supercharging system of the diesel engine are directly related. The parts such as the supercharger, the valve and the like which are not fully tested and verified are arranged on the two-stage sequential supercharging system of the diesel engine, so that the performance and the reliability of the whole system can not be ensured, and the test risk and the cost of the two-stage sequential supercharging system are increased. Therefore, in order to solve the problem of performance and reliability verification of the supercharger and the valve for the two-stage sequential supercharging system, a basic module test platform for the two-stage sequential supercharging system is an effective method.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a two-stage sequential supercharging system foundation module test platform and a test method, which are used for providing a pressure ratio distribution scheme and checking the reliability of parts such as a supercharger, a sequential valve and the like for a two-stage sequential supercharging system by selecting the supercharger.
The purpose of the invention is realized by the following steps:
the utility model provides a two-stage supercharging system foundation module test platform in succession which characterized in that: the system comprises a gas generating system, a high-pressure stage supercharger and a low-pressure stage supercharger;
the high-pressure stage supercharger comprises a high-pressure stage compressor and a high-pressure stage variable geometry turbine, the low-pressure stage supercharger comprises a low-pressure stage compressor and a low-pressure stage variable geometry turbine, the high-pressure stage variable geometry turbine and the low-pressure stage variable geometry turbine are connected in series, the low-pressure stage compressor and the high-pressure stage compressor are connected in series, the intercooler is connected between the low-pressure stage compressor and the high-pressure stage compressor in series, an inlet of the high-pressure stage variable geometry turbine is connected with an outlet of a fuel gas generating system, an outlet of the high-pressure stage compressor is connected with an air main branch and an air auxiliary branch, the air main branch is connected with an air inlet of the fuel gas generating system, the air auxiliary branch is connected with a fuel gas outlet of the fuel gas generating system, pressure P1 and temperature T1 measuring points are arranged on an air inlet pipeline of the low-pressure stage compressor, and a connecting pipeline of the intercooler is provided with pressure P2 and temperature T2 measuring points, pressure P3 and temperature T3 measuring points are arranged on a connecting pipeline of the intercooler and the high-pressure stage compressor, flow meter V1, pressure P4 and temperature T4 measuring points are arranged on an outlet pipeline of the high-pressure stage compressor, an air bypass valve and a flow meter V2 are arranged on an air secondary branch, flow meter V3, pressure P5 and temperature T5 measuring points are arranged on a gas inlet pipeline of the high-pressure stage variable geometry turbine, pressure P7 and temperature T7 measuring points are arranged on a gas outlet pipeline of the high-pressure stage variable geometry turbine, pressure P8 and temperature T8 measuring points are arranged on a gas inlet pipeline of the low-pressure stage variable geometry turbine, and pressure P9 and temperature T9 measuring points are arranged on a gas outlet pipeline of the low-pressure stage variable geometry turbine;
and a gas bypass branch is connected between the high-pressure stage variable geometry turbine gas inlet pipeline and the high-pressure stage variable geometry turbine gas outlet pipeline, and a sequential switching valve, a flowmeter V4, a gas bypass valve, a gas inlet pressure P6 and a temperature T6 measuring point are arranged on the gas bypass branch.
Preferably, the system also comprises a lubricating oil system, wherein the lubricating oil system provides lubricating oil for the high-pressure supercharger and the low-pressure supercharger, pressure P12 and temperature T12 measuring points are arranged on an inlet oil pipeline of the high-pressure supercharger, and a temperature T13 measuring point is arranged on an oil return pipeline of the high-pressure supercharger; the inlet oil pipeline of the low-pressure supercharger is provided with pressure P10 and temperature T10 measuring points, and the oil return pipeline is provided with a temperature T11 measuring point; the oil pressure of the lubricating oil system can be regulated.
Preferably, the gas generation system comprises a combustor, an air source valve, a deflation valve and a self-circulation valve, wherein the air source valve and the combustor are connected in series, an outlet of the combustor is an outlet of the gas generation system, the outlet of the gas generation system is connected with a high-pressure stage variable geometry turbine gas inlet pipeline, the deflation valve is connected with a high-pressure stage compressor outlet pipeline through a pipeline, an inlet of the deflation valve is an air inlet of the gas generation system, and the self-circulation valve is connected between an upstream end of the deflation valve and a downstream end of the air source valve.
Preferably, the low-pressure stage supercharger is provided with measuring points of rotating speed N1 and vibration M1, and the high-pressure stage supercharger is provided with measuring points of rotating speed N2 and vibration M2.
Preferably, the combustor adopts a straight-tube combustion chamber, and a plurality of groups of oil nozzles are distributed in the straight-tube combustion chamber, so that the simulation of different working conditions of the diesel engine system can be realized.
Preferably, the low-pressure stage variable geometry turbine is connected in series with the low-pressure stage compressor.
Preferably, the flow of inlet water and outlet water on the intercooler is adjusted through a water inlet valve and a water return valve.
Preferably, the system further comprises a measurement control system, wherein the measurement control system is connected with each device and is used for controlling each device and carrying out parameter measurement.
A test method for basic module test of two-stage sequential supercharging system,
s1: before the test begins, a lubricating oil system is started to supply lubricating oil for a high-pressure-stage supercharger and a low-pressure-stage supercharger, the pressure of the lubricating oil is kept at 2-3 bar, the time is kept for 10 minutes, whether the lubricating oil leaks from the high-pressure-stage supercharger and the low-pressure-stage supercharger is checked, and the lubricating oil sealing performance of the supercharger stalling state of the two-stage sequential supercharger system of the diesel engine is simulated through the test;
s2, opening a water inlet valve and a water return valve on the intercooler, keeping the water inlet quantity of one intercooler, and monitoring the temperature of the air outlet of the intercooler 7;
s3: the air bypass valve, the self-circulation valve, the sequential switching valve and the gas bypass valve are in a closed state; opening an air source valve to introduce compressed air to ignite the combustor, opening a self-circulation valve, and closing an air release valve and the air source valve to enable the platform to enter a self-circulation test state;
s4: the test of the equal-rotation speed line small-flow performance of the two-stage sequential supercharging system is realized by adjusting the fuel injection quantity of the combustor and the opening of the self-circulation valve;
s5: the test of the equal-rotating-speed and large-flow performance of a two-stage sequential pressurization system is realized by adjusting the oil injection quantity of the combustor and the opening degree of a vent valve;
s6: repeating the steps S5 and S6 to realize the test of the operating condition of the two-stage sequential supercharging system;
s7: adjusting the through-flow sections of the high-pressure-stage variable geometry turbine and the low-pressure-stage variable geometry turbine through a test bed control system, and repeating the steps S4, S5 and S6 to realize the pressure ratio distribution performance test of the basic module of the two-stage sequential supercharging system;
s8: the performance test of the influence of the cooling performance of the intercooler on the two-stage sequential supercharging system under different working conditions is realized by adjusting the amount of cooling water entering the intercooler and repeating the steps S4, S5 and S6;
s9: repeating the steps S4, S5 and S6 by adjusting different opening degrees of the air bypass valve, and realizing performance test of the influence of the opening degree of the air bypass valve on the sequential system of the two-stage supercharger under different working conditions;
s10: the performance test of the influence of the opening of the gas bypass valve on the sequential system of the two-stage supercharger under different working conditions is realized by opening the sequential switching valve, adjusting different openings of the gas bypass valve and repeating the steps S4, S5 and S6;
s11: closing the successive switching valve and the gas bypass valve, repeating the steps S4, S5 and S6, and measuring the leakage amount when the successive switching valve is closed through a flowmeter V4 on the gas bypass branch;
and closing the gas bypass valve, and opening and closing the successive switching valves to realize the reliability test of the successive switching valves under the conditions of high temperature and high pressure.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the matching performance of the two-stage sequential supercharging system and the supercharger, the lubricating oil sealing performance, the intercooler performance, the reliability of the sequential switching valve and the like can be verified through tests, the problems of the performance and the reliability of key parts of the two-stage sequential supercharging system of the diesel engine are solved, the reliability of the two-stage supercharger system is improved, and the test risk and the test cost of the two-stage supercharger system are reduced.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Reference numerals
In the drawing, 1 is a deflation valve, 2 is a self-circulation valve, 3 is a flow meter V2, 4 is an air bypass valve, 5 is a flow meter V1, 6 is a high-pressure stage supercharger, 6a is a high-pressure stage compressor, 6b is a high-pressure stage variable geometry turbine, 7 is an intercooler, 8 is a low-pressure stage supercharger, 8a is a low-pressure stage compressor, 8b is a low-pressure stage variable geometry turbine, 9 is a lubricating oil system, 10 is a gas bypass valve, 11 is a flow meter V4, 12 is a sequential switching valve, 13 is a flow meter V3, 14 is a combustor, 15 is a small air source valve, 16 is a gas generation system, and 17 is a measurement control system.
Detailed Description
Referring to fig. 1, a basic module test platform of a two-stage sequential supercharging system specifically comprises a gas generation system 16, a lubricating oil system 9, a measurement control system 17, a high-pressure stage supercharger 6, a low-pressure stage supercharger 8, an intercooler 7, a sequential switching valve 12 and the like. The measurement control system 17 is connected to each device (including all components capable of being controlled) and is used for controlling each device and performing parameter measurement at each measurement point. The platform can simulate the matching performance of a two-stage sequential supercharged diesel engine system and a supercharger.
The gas generating system 16 consists of a combustor 14, a small air source valve 15, a deflation valve 1 and a self-circulation valve 2, can simulate the diesel engine gas generating system to produce gas, and provides a power source for a two-stage sequential supercharging system test platform. The combustor 14 adopts a straight-tube combustion chamber, 8+4 groups of oil nozzles are distributed in the combustion chamber, and simulation of different working conditions of a diesel engine system can be realized. The small air source valve 15 is connected with an air source system, so that the two-stage sequential supercharged diesel engine system can be simulated to improve fuel gas under different working conditions and drive the test platform to work.
The high-pressure stage supercharger 6 and the low-pressure stage supercharger 8 are connected in series, wherein an intercooler 7 is connected between the low-pressure stage compressor 8a and the high-pressure stage compressor 6a in series, water flow on the intercooler can be automatically controlled, and the adjustment of the air inlet temperature of the high-pressure stage supercharger compressor can be realized. The outlet of the high-pressure stage compressor 6a is provided with a main air branch and an auxiliary air branch, wherein the main air branch is connected with the air inlet of the fuel gas generation system, and the auxiliary air branch is connected with the fuel gas outlet of the fuel gas generation system. The main air branch is connected to the gas generating system through the self-circulation valve 2. The air release valve 1 is open to the atmosphere and is not connected with the small air source valve 15. Pressure P1 and temperature T1 measuring points are arranged on an air inlet pipeline of the low-pressure stage compressor, pressure P2 and temperature T2 measuring points are arranged on a connecting pipeline of the intercooler 7 and the high-pressure stage compressor, pressure P3 and temperature T3 measuring points are arranged on a connecting pipeline of the intercooler and the high-pressure stage compressor, and a flowmeter V1, pressure P4 and temperature T4 measuring points are arranged on an outlet pipeline of the high-pressure stage compressor, so that measurement of performance parameters of the high-pressure stage compressor 6a, the low-pressure stage compressor 6b and a system is realized. The turbine and the compressor are connected in series, the compressor impeller and the turbine are on the same shaft, and the turbine drives the compressor impeller to perform the function of compressing air.
An air bypass valve 4 and a flowmeter V2 are arranged on the air auxiliary branch, so that the influence of the opening performance of the air bypass valve on the system can be measured.
The high-pressure grade variable geometry turbine and the low-pressure grade variable geometry turbine are connected in series through a pipeline, and an inlet of the high-pressure grade variable geometry turbine is connected with an outlet of the gas generation system; the high-pressure grade variable geometry turbine gas inlet pipeline is provided with measuring points of a flowmeter V3, a pressure P5 and a temperature T5, and the high-pressure grade variable geometry turbine gas outlet pipeline is provided with measuring points of a pressure P7 and a temperature T7; the low-pressure grade variable geometry turbine gas inlet pipeline is provided with pressure P8 and temperature T8 measuring points, and the low-pressure grade variable geometry turbine gas outlet pipeline is provided with pressure P9 and temperature T9 measuring points; and measuring the high-pressure step variable geometry turbine 6b, the low-pressure step variable geometry turbine 8b and system performance parameters.
A gas bypass branch is arranged between the high-pressure stage variable geometry turbine 6b and the low-pressure stage variable geometry turbine 8b, and a sequential switching valve 12, a flowmeter V4, a gas bypass valve 10, a gas inlet pressure P6 point and a temperature T6 point are arranged on the gas bypass branch, so that test verification of sealing performance of the sequential switching valve 12, opening performance and reliability of the gas bypass valve 10 can be realized. The two-stage successive supercharging system basic module test platform is provided with a successive switching valve and a leakage flow measuring device, and can be subjected to performance and switch reliability examination tests under the conditions of high temperature and high pressure gas.
The flow of inlet water and outlet water on the intercooler 7 is adjustable, and the influence of the cooling performance of the intercooler 7 on the efficiency of the two-stage sequential supercharger system can be tested.
The high-pressure stage supercharger turbine 6b and the low-pressure stage supercharger turbine 8b adopt a variable geometry turbine design, the flow areas of the high-pressure stage supercharger turbine 6b and the low-pressure stage supercharger turbine 8b can be adjusted through the test control system 17, and switching of turbines of different specifications of a basic module platform of a two-stage sequential supercharging system is achieved, so that the purpose of simulating a pressure ratio distribution test of the two-stage sequential supercharger system is achieved.
A lubricating oil system 9 provides pressurized lubricating oil for the high-pressure stage supercharger 6 and the low-pressure stage supercharger 8. Pressure P12 and temperature T12 measuring points are arranged on an inlet oil pipeline of the high-pressure stage supercharger 6, and a temperature T13 measuring point is arranged on an oil return pipeline; pressure P10 and temperature T10 measuring points are arranged on an inlet oil pipeline of the low-pressure stage supercharger 8, and a temperature T11 measuring point is arranged on an oil return pipeline; the device is used for measuring the parameters of the inlet and outlet lubricating oil of the high-pressure stage supercharger 6 and the low-pressure stage supercharger. The lubricating oil system 9 is adjustable in oil pressure, and can be used for testing the oil supply characteristics of the supercharger system of the two-stage sequential system and guiding the design of the lubricating oil supply system of the two-stage sequential supercharging system. The lubricating system has the functions of adjustable lubricating oil pressure and emergency lubricating oil, can simulate the working conditions of two-stage sequential supercharged diesel engine systems for supplying oil to the supercharger, and realizes sequential supercharger system lubricating oil sealing tests.
The low-pressure stage supercharger 8 is provided with measuring points for rotating speed N1 and vibration M1, and the high-pressure stage supercharger 6 is provided with measuring points for rotating speed N2 and vibration M2, so that the safe operation parameters of the high-pressure stage supercharger 6 and the low-pressure stage supercharger 8 can be monitored.
The test method of the basic module test of the two-stage sequential supercharging system comprises the following steps:
s1: before the test of the basic module of the two-stage sequential supercharging system starts, a lubricating oil system 9 is started to supply lubricating oil for a high-pressure stage supercharger 6 and a low-pressure stage supercharger 8, the pressure of the lubricating oil is kept at 2-3 bar, the time is kept for 10 minutes, whether the lubricating oil leaks from the high-pressure stage supercharger 6 and the low-pressure stage supercharger 8 is checked, and the lubricating oil sealing performance of the supercharger stalling state of the two-stage sequential supercharging system of the diesel engine is simulated through the test.
And S2, opening a water inlet valve and a water return valve on the intercooler 7, keeping a certain water inflow of the intercooler, and monitoring the temperature of an air outlet of the intercooler 7.
S3: the air bypass valve 4, the self-circulation valve 2, the sequential switching valve 12 and the gas bypass valve 10 are in a closed state; after the small air source valve 15 is opened and compressed air is introduced to ignite the combustor 14, the self-circulation valve 2 is opened, and the air release valve 1 and the small air source valve 15 are closed, so that the two-stage sequential supercharging system basic module test platform enters a self-circulation test state.
S4: the test of the equal-rotation speed line small-flow performance of the two-stage sequential supercharging system is realized by adjusting the fuel injection quantity of the combustor 14 and the opening of the self-circulation valve 2.
S5: the test of the equal-rotating-speed large-flow performance of a two-stage sequential pressurization system is realized by adjusting the fuel injection quantity of the combustor 14 and the opening degree of the air release valve 1.
S6: and repeating the steps S5 and S6 to realize the test of the running condition of the whole two-stage supercharger sequential system.
S7: through the test bed control system 17, the through-flow sections of the high-pressure stage variable geometry turbine 6b and the low-pressure stage variable geometry turbine 8b are automatically adjusted, and the steps S4, S5 and S6 are repeated, so that the pressure ratio distribution performance test of basic modules of the two-stage supercharger sequential system is realized.
S8: and (3) repeating the steps of S4, S5 and S6 by adjusting the amount of cooling water entering the intercooler 7, so that the influence of the cooling performance of the intercooler 7 on the sequential system of the two-stage supercharger on the performance test under different working conditions is realized.
S9: and repeating the steps S4, S5 and S6 by adjusting different opening degrees of the air bypass valve 4, thereby realizing the performance test of the influence of the opening degree of the air bypass valve 4 on the sequential system of the two-stage supercharger under different working conditions.
S10: and (3) by opening the sequential switching valve 12, adjusting different opening degrees of the gas bypass valve 10, and repeating the steps S4, S5 and S6, so that the effect of the opening degree of the gas bypass valve 10 on the sequential system performance test of the two-stage supercharger under different working conditions is realized.
S11: closing the successive switching valve 12 and the gas bypass valve 10, repeating the steps S4, S5, S6, and measuring the leakage amount when the successive switching valve 12 is closed by the flowmeter measurement V4 on the gas bypass branch; and closing the gas bypass valve 10, opening and closing the successive switching valves 12, and realizing the reliability test of the successive switching valves 12 under the conditions of high temperature and high pressure.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a two-stage supercharging system foundation module test platform in succession which characterized in that: the system comprises a gas generating system, a high-pressure stage supercharger and a low-pressure stage supercharger;
the high-pressure stage supercharger comprises a high-pressure stage compressor and a high-pressure stage variable geometry turbine, the low-pressure stage supercharger comprises a low-pressure stage compressor and a low-pressure stage variable geometry turbine, the high-pressure stage variable geometry turbine and the low-pressure stage variable geometry turbine are connected in series, the low-pressure stage compressor and the high-pressure stage compressor are connected in series, the intercooler is connected between the low-pressure stage compressor and the high-pressure stage compressor in series, an inlet of the high-pressure stage variable geometry turbine is connected with an outlet of a fuel gas generating system, an outlet of the high-pressure stage compressor is connected with an air main branch and an air auxiliary branch, the air main branch is connected with an air inlet of the fuel gas generating system, the air auxiliary branch is connected with a fuel gas outlet of the fuel gas generating system, pressure P1 and temperature T1 measuring points are arranged on an air inlet pipeline of the low-pressure stage compressor, and a connecting pipeline of the intercooler is provided with pressure P2 and temperature T2 measuring points, pressure P3 and temperature T3 measuring points are arranged on a connecting pipeline of the intercooler and the high-pressure stage compressor, flow meter V1, pressure P4 and temperature T4 measuring points are arranged on an outlet pipeline of the high-pressure stage compressor, an air bypass valve and a flow meter V2 are arranged on an air secondary branch, flow meter V3, pressure P5 and temperature T5 measuring points are arranged on a gas inlet pipeline of the high-pressure stage variable geometry turbine, pressure P7 and temperature T7 measuring points are arranged on a gas outlet pipeline of the high-pressure stage variable geometry turbine, pressure P8 and temperature T8 measuring points are arranged on a gas inlet pipeline of the low-pressure stage variable geometry turbine, and pressure P9 and temperature T9 measuring points are arranged on a gas outlet pipeline of the low-pressure stage variable geometry turbine;
and a gas bypass branch is connected between the high-pressure stage variable geometry turbine gas inlet pipeline and the high-pressure stage variable geometry turbine gas outlet pipeline, and a sequential switching valve, a flowmeter V4, a gas bypass valve, a gas inlet pressure P6 and a temperature T6 measuring point are arranged on the gas bypass branch.
2. The two-stage sequential turbocharging system base module test platform of claim 1, wherein: the lubricating oil system provides lubricating oil for the high-pressure supercharger and the low-pressure supercharger, pressure P12 and temperature T12 measuring points are arranged on an inlet oil pipeline of the high-pressure supercharger, and a temperature T13 measuring point is arranged on an oil return pipeline of the high-pressure supercharger; the inlet oil pipeline of the low-pressure supercharger is provided with pressure P10 and temperature T10 measuring points, and the oil return pipeline is provided with a temperature T11 measuring point; the oil pressure of the lubricating oil system can be regulated.
3. The two-stage sequential turbocharging system base module test platform of claim 1, wherein: the gas generating system comprises a combustor, an air source valve, a deflation valve and a self-circulation valve, wherein the air source valve and the combustor are connected in series, the outlet of the combustor is the outlet of the gas generating system, the outlet of the gas generating system is connected with a high-pressure-level variable geometry turbine gas inlet pipeline, the deflation valve is connected with a high-pressure-level compressor outlet pipeline through a pipeline, the inlet of the deflation valve is the air inlet of the gas generating system, and the self-circulation valve is connected between the upstream end of the deflation valve and the downstream end of the air source valve.
4. The two-stage sequential turbocharging system base module test platform of claim 1, wherein: the low-pressure stage supercharger is provided with a rotating speed N1 and vibration M1 measuring point, and the high-pressure stage supercharger is provided with a rotating speed N2 and a vibration M2 measuring point.
5. The two-stage sequential turbocharging system base module test platform of claim 1, wherein: the combustor adopts a straight-tube combustion chamber, and a plurality of groups of oil nozzles are distributed in the straight-tube combustion chamber, so that the simulation of different working conditions of a diesel engine system can be realized.
6. The two-stage sequential turbocharging system base module test platform of claim 1, wherein: the low-pressure stage variable geometry turbine is connected with the low-pressure stage compressor in series.
7. The two-stage sequential turbocharging system base module test platform of claim 1, wherein: the flow of inlet water and outlet water on the intercooler is adjusted through a water inlet valve and a water return valve.
8. A two-stage sequential turbocharging system base module test platform according to any of claims 1-7, wherein: the device also comprises a measurement control system, wherein the measurement control system is connected with each device and is used for controlling each device and carrying out parameter measurement.
9. A test method for a two-stage sequential supercharging system foundation module test is characterized by comprising the following steps:
s1: before the test begins, a lubricating oil system is started to supply lubricating oil for a high-pressure-stage supercharger and a low-pressure-stage supercharger, the pressure of the lubricating oil is kept at 2-3 bar, the time is kept for 10 minutes, whether the lubricating oil leaks from the high-pressure-stage supercharger and the low-pressure-stage supercharger is checked, and the lubricating oil sealing performance of the supercharger stalling state of the two-stage sequential supercharger system of the diesel engine is simulated through the test;
s2, opening a water inlet valve and a water return valve on the intercooler, keeping the water inlet quantity of one intercooler, and monitoring the temperature of the air outlet of the intercooler 7;
s3: the air bypass valve, the self-circulation valve, the sequential switching valve and the gas bypass valve are in a closed state; opening an air source valve to introduce compressed air to ignite the combustor, opening a self-circulation valve, and closing an air release valve and the air source valve to enable the platform to enter a self-circulation test state;
s4: the test of the equal-rotation speed line small-flow performance of the two-stage sequential supercharging system is realized by adjusting the fuel injection quantity of the combustor and the opening of the self-circulation valve;
s5: the test of the equal-rotating-speed and large-flow performance of a two-stage sequential pressurization system is realized by adjusting the oil injection quantity of the combustor and the opening degree of a vent valve;
s6: repeating the steps S5 and S6 to realize the test of the operating condition of the two-stage sequential supercharging system;
s7: adjusting the through-flow sections of the high-pressure-stage variable geometry turbine and the low-pressure-stage variable geometry turbine through a test bed control system, and repeating the steps S4, S5 and S6 to realize the pressure ratio distribution performance test of the basic module of the two-stage sequential supercharging system;
s8: the performance test of the influence of the cooling performance of the intercooler on the two-stage sequential supercharging system under different working conditions is realized by adjusting the amount of cooling water entering the intercooler and repeating the steps S4, S5 and S6;
s9: repeating the steps S4, S5 and S6 by adjusting different opening degrees of the air bypass valve, and realizing performance test of the influence of the opening degree of the air bypass valve on the sequential system of the two-stage supercharger under different working conditions;
s10: the performance test of the influence of the opening of the gas bypass valve on the sequential system of the two-stage supercharger under different working conditions is realized by opening the sequential switching valve, adjusting different openings of the gas bypass valve and repeating the steps S4, S5 and S6;
s11: closing the successive switching valve and the gas bypass valve, repeating the steps S4, S5 and S6, and measuring the leakage amount when the successive switching valve is closed through a flowmeter V4 on the gas bypass branch;
and closing the gas bypass valve, and opening and closing the successive switching valves to realize the reliability test of the successive switching valves under the conditions of high temperature and high pressure.
Priority Applications (1)
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