CN112729840A - Engine test bed - Google Patents
Engine test bed Download PDFInfo
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- CN112729840A CN112729840A CN202011572215.2A CN202011572215A CN112729840A CN 112729840 A CN112729840 A CN 112729840A CN 202011572215 A CN202011572215 A CN 202011572215A CN 112729840 A CN112729840 A CN 112729840A
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- 238000012360 testing method Methods 0.000 title claims abstract description 106
- 230000030279 gene silencing Effects 0.000 claims abstract description 36
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 238000007599 discharging Methods 0.000 claims abstract description 16
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- 238000001179 sorption measurement Methods 0.000 claims description 26
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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
Abstract
An air supply end of an air source is respectively communicated with an air inlet channel of a 1# engine test bed, an air inlet channel of a 2# engine main test bed and an air inlet channel of a 2# engine auxiliary test bed through an air source main pipeline; the air discharging end of the air source is communicated with one end of an air discharging pipeline, and the other end of the air discharging pipeline is communicated with a silencing device; two ends of the vertical oil-gas separation device are respectively communicated with a main exhaust pipeline outlet and an exhaust main pipeline inlet of a 2# engine test bed; the 1# engine test bed exhaust pipeline and the 2# engine test bed secondary exhaust pipeline are arranged in parallel and are communicated with an inlet of the main exhaust pipeline; the outlet of the main exhaust pipeline is communicated with a silencing device; according to the engine test bed device, the air source is simultaneously supplied to the plurality of test beds and the stations, the integration level of the whole test plant area is improved, and the device is suitable for the working condition that the exhaust pipelines of the plurality of engine test beds or the plurality of stations of one engine test bed share the same silencing tower.
Description
Technical Field
The invention relates to the technical field of engine tests, in particular to an engine test bed.
Background
The noise sources polluting various workplaces and surrounding environments of the engine test bed mainly come from aerodynamic noise, and the noise sources only exist in the test bed during test, and generate noise of more than 130dB (A) when high-pressure, high-speed and high-temperature compressed air and fuel gas flow in a metal or other enclosing structures or are exhausted to the atmosphere. Noise is unnecessary sound, the frequency of sound that can be heard by human ears is within 20HZ to 20000HZ, which is directly perceived by human beings, and noise outside this frequency is not perceived by human ears as a silent killer, and is also the object of noise control. At present, each country regulates noise to be controlled within different sound pressure levels according to different environments. According to the relevant regulations of the domestic environmental protection law, the noise sound pressure level of a newly built enterprise working for 8 hours every day is allowed to be 85dB (A), and the noise sound pressure level of the newly built enterprise working for 1 hour every day is allowed to be 94dB (A). For the engine test bed with acoustic power larger than 130dB (A), short action time and working places far away from towns and residential areas, the noise control aims to ensure that the noise of the working places of the test bed reaches the specified index and reduce the noise of the environment outside the test bed as far as possible.
In the existing silencing device for the engine test bed, a variable frequency diffuser is arranged at the tail end of an exhaust pipeline, through-hole type variable frequency diffuser air outlet holes are formed in the surface of the variable frequency diffuser, air flow enables the noise frequency to shift to high frequency through the plurality of variable frequency diffuser air outlet holes, and the noise control difficulty is reduced by utilizing the principle that the high frequency ratio and the low frequency ratio are easy to perform noise elimination control; but when exhaust pipe and/or bypass pressure release pipeline to a plurality of stations of a plurality of engine test benches or an engine test bench, need set up a plurality of noise towers, will lead to the construction maintenance cost to improve by a wide margin, and get into same noise tower, when a plurality of exhaust pipe and/or bypass pressure release pipeline got into same noise tower promptly, every pipeline tail end all sets up the frequency conversion diffuser, there is mutual interference's phenomenon in a plurality of frequency conversion diffuser's venthole exhanst gas, produce secondary noise pollution, the amortization degree of difficulty has been increaseed.
When a flame tube oil mist field test and a nozzle thermal protection test are carried out, exhaust gas contains a large amount of kerosene vapor and vapor droplets, and the kerosene vapor and the vapor droplets are discharged into the atmosphere after oil-gas separation treatment. The fuel concentration in the exhaust gas meets the secondary emission standard of the Integrated emission Standard for air pollutants (GB 16297 and 1996), namely the maximum allowable emission concentration of non-methane hydrocarbon is 120mg/m3, and the maximum allowable emission rate is 53kg/h (the exhaust height is 30 m).
As early as the thirty years of the last century, demisters were invented for the needs of industrial production. The demister can be divided into a plurality of types according to the application or structure of the demister, such as a louver type separator, a gravity settling type separator and a cyclone plate separator, but the separators have low separation efficiency and are not easy to separate mist with smaller particle size; although the wire mesh demister can separate common mist, the mist is required to be clean, the airflow velocity is small, the resistance is reduced greatly, the service cycle is short, and the equipment investment is large.
Therefore, the problems which need to be solved urgently in a flame tube oil mist field test and a nozzle heat protection test of a novel efficient demister with high research and production separation efficiency, small resistance reduction, large allowable air flow speed and strong anti-blocking function are solved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the engine test bed is provided.
The technical solution of the invention is as follows:
an engine test bed comprises a 1# engine test bed, a 2# engine main test bed, a 2# engine auxiliary test bed, an air source, a vertical oil-gas separation device and a silencing device; the air supply end of the air source is respectively communicated with an air inlet channel of a 1# engine test bed, an air inlet channel of a 2# engine main test bed and an air inlet channel of a 2# engine auxiliary test bed through an air source main pipeline; the air discharging end of the air source is communicated with one end of an air discharging pipeline, and the other end of the air discharging pipeline is communicated with a silencing device; two ends of the vertical oil-gas separation device are respectively communicated with a main exhaust pipeline outlet and an exhaust main pipeline inlet of a No. 2 engine test bed; the exhaust pipeline of the 1# engine test bed and the secondary exhaust pipeline of the 2# engine test bed are arranged in parallel and are communicated with the inlet of the main exhaust pipeline; the outlet of the main exhaust pipeline is communicated with a silencing device; the vertical oil-gas separation device comprises a demister and an active carbon adsorption device; the gas outlet of the demister is communicated with the gas inlet of the active carbon adsorption device through a gas conveying pipeline; the demister comprises a shell formed by sequentially connecting an upper end enclosure, a shell section and a lower end enclosure, an air inlet is formed in the lower portion of the shell section and is communicated with an outlet of an exhaust pipeline of a second engine test bed, and a gas outlet of the demister is formed in the top of the upper end enclosure; a baffle plate demister is arranged above the air inlet in the cylinder section, a wire mesh demister is arranged at the top in the cylinder section, and the wire mesh demister is positioned above the baffle plate demister; a spraying and washing device is arranged on the side wall of the shell section; a liquid outlet is arranged at the bottom of the lower end enclosure; the activated carbon adsorption device comprises an activated carbon box body which is horizontally arranged; along the flowing direction of gas discharged from a gas outlet of the demister, a vertical activated carbon adsorption tank and a horizontal activated carbon adsorption tank are sequentially arranged in an activated carbon box body, the activated carbon box body is provided with a gas outlet, and the gas outlet of the activated carbon box body is communicated with a silencing device through a pipeline; meanwhile, the bottom of the activated carbon box body is provided with a liquid outlet of the activated carbon adsorption device.
Furthermore, the silencing device comprises a tower body, a silencing plate assembly and 2 variable-frequency diffusers, wherein each variable-frequency diffuser is identical in structure; each variable frequency diffuser comprises a variable frequency diffuser cylinder and a variable frequency diffuser diversion cone, the variable frequency diffuser cylinder is a hollow circular cylinder, a plurality of variable frequency diffuser air outlet holes are formed in the surface of the cylinder, and the variable frequency diffuser air outlet holes are through holes penetrating through the circular cylinder; the variable-frequency diffuser flow guide cone is cone-shaped, the conical surface of the variable-frequency diffuser flow guide cone is arranged in the circular cylinder, and the excircle at the bottom of the variable-frequency diffuser flow guide cone is fixedly connected with one end face of the circular cylinder; in each variable-frequency diffuser, the projection of the air outlet hole of the variable-frequency diffuser along the axis direction of the variable-frequency diffuser is not on the cylinder body of the variable-frequency diffuser adjacent to the variable-frequency diffuser; the outlet of the main exhaust pipeline is communicated with a silencing device; the air discharge pipeline is communicated with the silencing device; the air discharge pipeline is communicated with one variable-frequency diffuser, and the outlet of the main exhaust pipeline is communicated with the other variable-frequency diffuser.
Furthermore, the spraying and flushing device comprises a first spraying and flushing device, a second spraying and flushing device, a third spraying and flushing device and a fourth spraying and flushing device.
Further, the baffling board demister includes baffling board piece and barb, and the barb sets up the department of buckling at the baffling board piece.
Further, the baffled demister comprises a plurality of baffling plates.
Furthermore, the aperture ratio of the outlet hole of the variable frequency diffuser of each variable frequency diffuser is 30-65%.
Furthermore, in each variable frequency diffuser, the sum of the areas of the air outlet holes of the variable frequency diffuser is larger than the cross-sectional area of the cylinder body of the variable frequency diffuser.
Furthermore, in each variable frequency diffuser, the sum of the areas of the air outlet holes of the variable frequency diffuser is at least 1.1 times of the cross-sectional area of the cylinder body of the variable frequency diffuser.
Furthermore, a plurality of variable frequency diffusers are arranged in parallel.
Compared with the prior art, the invention has the advantages that:
1. in the engine test bed, the air source is simultaneously supplied to a plurality of test beds and stations, the integration level of the whole test plant area is improved, the air discharge pipeline, the exhaust pipelines of different test beds and the exhaust pipelines of different stations of the same test bed are introduced into the same silencer, the construction and operation cost is reduced, meanwhile, the condition that air flows discharged from a plurality of variable-frequency air outlet holes interfere with diffusers is avoided or reduced, secondary noise pollution is avoided, and the silencing difficulty is reduced.
2. In the engine test bed, the oil-gas separation silencing device occupies small area, is suitable for oil-gas separation of large-flow gas, is easy to install, simple to operate and good in defoaming effect, and can realize 99% removal of oil drops; meanwhile, the device can adapt to any gas with liquid, effectively reduce the blocking condition of the demister and ensure the long-time use of the demister.
3. In the engine test bed, the oil-gas separation silencer adopts the baffle plate demister to effectively separate oil drops and liquid drops of 20-50 um by 100 percent, adopts the wire mesh demister to effectively separate oil drops and liquid drops of 5-20 um by 99 percent, and can realize the purpose of oil-gas separation by adjusting the plate interval of the baffle plate demister and the thickness of the wire mesh demister according to different oil-gas separation requirements.
4. In the engine test bed, the oil-gas separation silencing device adopts the spray flushing device to flush the baffle plate demister, and flush and remove scales attached to the baffle plate demister after long-term operation.
5. In the engine test bed, the oil-gas separation silencing device is provided with the activated adsorption carbon device, oil drops with the size less than 5 mu m are adsorbed, the organic waste gas purification efficiency can reach 90-95% through adsorption, the gas treated by the vertical oil-gas separation device can be further ensured to meet the national emission standard, and in addition, the activated carbon can be reused or replaced by desorption and regeneration of hot air after the activated carbon is saturated through adsorption.
6. In the engine test bed, 2 variable frequency diffusers are adopted as the silencing device, and because the projection of the air outlet hole of each variable frequency diffuser along the axis direction of the variable frequency diffuser is not on the variable frequency diffuser cylinder body of the adjacent variable frequency diffuser, namely the air flow discharged from the air outlet hole of the variable frequency diffuser in each variable frequency diffuser is not in contact with the adjacent variable frequency diffuser cylinder body, the impact on the adjacent variable frequency diffuser cylinder body can not be generated, the condition that the air flows discharged from the air outlet holes of a plurality of variable frequency diffusers are mutually interfered can be avoided or reduced, the secondary noise pollution can be avoided, and the silencing difficulty can be reduced.
7. In the engine test bed, the silencing device adopts 2 variable-frequency diffusers, the sum of the areas of the air outlet holes of the variable-frequency diffusers of each variable-frequency diffuser is increased, the flow velocity of air flow passing through the air outlet holes of the variable-frequency diffusers is reduced, and the noise of flowing gas is reduced along with the reduction of the flow velocity of the flowing gas, so the original noise level of the air flow in the silencing tower is reduced, and the silencing difficulty is reduced.
8. In the engine test bed, the silencing device adopts 2 variable frequency diffusers, is suitable for the working condition that exhaust pipelines and/or bypass pressure relief pipelines of a plurality of engine test beds or a plurality of stations of one engine test bed share the same silencing tower, avoids mutual interference of air flows exhausted from air outlets of the plurality of variable frequency diffusers, avoids secondary noise pollution and reduces silencing difficulty.
Drawings
Fig. 1 is a schematic view of an engine test bed of the present invention.
Fig. 2 is a schematic structural diagram of a vertical oil-gas separation device in the engine test bed of the invention.
Fig. 3 is a sectional view a-a in fig. 2.
FIG. 4 is a schematic diagram of the vertical oil-gas separator demister with two S2-shaped baffle plates in the engine test bed of the present invention.
Fig. 5 is a schematic diagram of the three-barb S3 type baffle demister of the vertical oil-gas separator in the engine test bed of the invention.
FIG. 6 is a schematic diagram of a vertical oil-gas separator demister with four barb S4 type baffle plates in an engine test bed of the invention.
Fig. 7 is a schematic diagram of the working principle of the activated carbon adsorption device of the vertical oil-gas separator in the engine test bed of the invention.
Fig. 8 is a schematic structural view of a muffler device in the engine test bed of the present invention.
Fig. 9 is a schematic structural diagram of 2 variable frequency diffusers in a silencer in an engine test bed according to the present invention.
Fig. 10 is a schematic radial cross-sectional view of a structure of 2 variable frequency diffusers in a muffler device in an engine test bed according to the present invention.
Fig. 11 is a schematic structural view of a first variable frequency diffuser of the 2 variable frequency diffusers in the muffler device in the engine test bed of the present invention.
Fig. 12 is a schematic structural view of a first variable frequency diffuser flow cone in the first variable frequency diffuser of fig. 11.
Fig. 13 is a schematic structural view of a second variable frequency diffuser of the 2 variable frequency diffusers in the muffler device in the engine test bed of the present invention.
Fig. 14 is a schematic structural view of a second variable frequency diffuser flow cone in the second variable frequency diffuser of fig. 13.
Detailed Description
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 14, an engine test bed comprises a 1# engine test bed 10, a 2# engine main test bed 20, a 2# engine auxiliary test bed 30, an air source 40, a vertical oil-gas separation device 20 and a silencing device 100.
The air supply end of the air source 40 is respectively communicated with an air inlet channel 11 of a 1# engine test bed of the 1# engine test bed 10, an air inlet channel 21 of a 2# engine main test bed of the 2# engine main test bed and an air inlet channel 31 of a 2# engine auxiliary test bed of the 2# engine auxiliary test bed through an air source main pipeline 41; the air discharging end of the air source 41 is communicated with one end of an air discharging pipeline 42, and the other end of the air discharging pipeline 42 is communicated with the silencing device 100.
Two ends of the vertical oil-gas separation device 200 are respectively communicated with an outlet of a main exhaust pipeline 22 of the 2# engine test bed 20 and an inlet of a main exhaust pipeline 50; the 1# engine test bed exhaust pipeline 12 of the 1# engine test bed 10 and the 2# engine test bed secondary exhaust pipeline 32 of the 2# engine secondary test bed 30 are arranged in parallel and are communicated with the inlet of the exhaust main pipeline 50; the outlet of the exhaust main pipe 50 communicates with the muffler device 100;
the vertical oil-gas separation device 200 comprises a demister 210 and an active carbon adsorption device 220; the gas outlet of the demister 210 is communicated with the gas inlet of the activated carbon adsorption device 220 through a gas conveying pipeline 230; the demister 210 comprises a shell body formed by sequentially connecting an upper sealing head 214, a shell section 215 and a lower sealing head 216, wherein the lower part of the shell section 215 is provided with an air inlet 213, and the air inlet 213 is communicated with an outlet of the exhaust pipeline 20 of the second engine test bed; the top of the upper sealing head 214 is provided with a gas outlet of the demister 210; a baffle plate demister 211 is arranged in the cylindrical shell 215 above the air inlet 213, a wire mesh demister 212 is arranged at the top in the cylindrical shell 215, and the wire mesh demister 212 is arranged above the baffle plate demister 211; the demister 210 innovatively adopts a baffle demister 211 and a wire mesh demister 212 combined high-efficiency mold discharging device, wherein the baffle plate demister effectively separates oil drops and liquid drops of 20-50 um by 100%; the wire mesh demister can effectively separate 99% of liquid drops below 20um and above 5 um; aiming at the characteristics that the flow channel of the baffle plate demister is large and is not easy to block, gas firstly enters the baffle plate demister to preferentially remove oil drops and liquid drops of 20-50 um, and the subsequent screen mesh demister is protected from being blocked due to large oil quantity.
Preferably, the bottom of the lower end enclosure 216 is provided with demister support legs 219, and the elevation of the demister 210 is adjusted by adjusting the demister support legs 219, so as to adapt to pipelines with different elevations.
Preferably, the baffle demister 211 comprises a baffle plate 2111 and a barb 2112, wherein the barb 2112 is arranged at the bent part of the baffle plate 2111; the baffle demister 211 comprises a plurality of baffle plates 2111 arranged in parallel, and a barb 2112 is arranged at the bent part of each baffle plate 2111.
The baffle demister 211 involved in the invention is separated according to the principle of physical inertia, when the gas flow carrying liquid drops or solid particles passes through a specially designed baffle plate at the speed of 3-9m/s, the movement direction of the liquid drops or the solid particles and the movement direction of the gas are changed under the action of inertia force at the turning position of the baffle plate, so that the liquid drops or the solid particles are separated from the gas. The separation process can be divided into the following three steps:
1. the gas is divided into a plurality of individual flow channels.
2. The inertial force impacts the droplets on the baffle plate.
3. The drip membrane moves forward to the barb and is detached.
The structure is characterized in that the baffle plate demister has different forms according to different purposes, wherein the S shape is an impact type high-efficiency demister mainly applied to airflow flowing in the horizontal direction, higher surface speed is allowed under the conditions of low resistance reduction and high-efficiency separation, and the principle schematic diagrams of the S2 type baffle plate demister with two barbs, the S3 type baffle plate demister with three barbs and the S4 type baffle plate demister with four barbs are shown in the attached drawing according to the size of the limit droplet diameter of mist, the mist load and dust in the airflow.
The baffle demister 211 can effectively remove liquid drops with different sizes by changing baffle plate forms, such as baffle angles of 60 degrees, 90 degrees or 120 degrees, and grooved plates, and can achieve the best defoaming effect of liquid drops with the size of 30 mu m by adjusting the distance between the baffles.
The wire mesh demister 212 achieves the best defoaming effect of 5 μm droplets by changing the type of wire mesh and the thickness of the wire mesh demister, for example, the types of wire mesh are SP type, HP type, DP type and HR type.
The side walls of the bowl section 215 are fitted with spray rinsing means, preferably comprising a first spray rinsing means 2171, a second spray rinsing means 2172, a third spray rinsing means 2173 and a fourth spray rinsing means 2174. The baffle plate demister 211 is washed by the spray head, and scales attached to the baffle plate demister 211 after long-term operation are washed and removed.
The bottom of the lower head 216 is provided with a liquid outlet 218 for intensively discharging the discharged liquid.
The activated carbon adsorption device 220 comprises an activated carbon box 221 which is horizontally arranged; along the flowing direction of gas discharged from a gas outlet of the demister, a vertical activated carbon adsorption tank 222 and a horizontal activated carbon adsorption tank 223 are sequentially arranged in an activated carbon tank body, the activated carbon tank body 221 is provided with a gas outlet 225, and the gas outlet 225 of the activated carbon tank body 221 is communicated with the silencer 100 through a pipeline; meanwhile, the bottom of the activated carbon box body is provided with an activated carbon adsorption device liquid outlet 224. Preferably, the bottom of the activated carbon box 221 is provided with a support leg 226, so that the elevation of the activated carbon box 221 can be adjusted through the support leg 226. The active carbon adsorption device is arranged to adsorb oil drops with the diameter less than 5 mu m, the adsorption can ensure that the purification efficiency of organic waste gas reaches 90-95 percent, further ensure that the gas treated by the vertical oil-gas separation device meets the national emission standard, and in addition, the active carbon can be regenerated by hot air desorption after the adsorption saturation so that the active carbon is put into use again or replaced.
The silencer comprises a tower body 130, a silencer sheet assembly 140, a first variable-frequency diffuser 110 and a second variable-frequency diffuser 120, wherein each variable-frequency diffuser is identical in structure; each variable frequency diffuser comprises a variable frequency diffuser cylinder and a variable frequency diffuser diversion cone, the variable frequency diffuser cylinder is a hollow circular cylinder, a plurality of variable frequency diffuser air outlet holes are formed in the surface of the cylinder, and the variable frequency diffuser air outlet holes are through holes penetrating through the circular cylinder; the frequency conversion diffuser flow guide cone is cone-shaped, the conical surface of the frequency conversion diffuser flow guide cone is arranged inside the circular cylinder, and the excircle of the bottom of the frequency conversion diffuser flow guide cone is fixedly connected with one end face of the circular cylinder. In each variable-frequency diffuser, the projection of the air outlet hole of the variable-frequency diffuser along the axis direction of the variable-frequency diffuser is not on the cylinder body of the variable-frequency diffuser adjacent to the variable-frequency diffuser; the bleed air line 42 communicates with the one variable frequency diffuser 110 and the outlet of the main exhaust line 50 communicates with the second variable frequency diffuser 120.
The gas that first engine test bed exhaust pipe line 10 and activated carbon box 221's gas outlet 225 discharged by the terminal surface entering of frequency conversion diffuser barrel opening one end, through the water conservancy diversion awl water conservancy diversion of frequency conversion diffuser, discharge by a plurality of frequency conversion diffuser ventholes, the gas water conservancy diversion that will get into the frequency conversion diffuser barrel through the frequency conversion diffuser water conservancy diversion awl that sets up the cone type for the even discharge from a plurality of frequency conversion diffuser ventholes of the gas that gets into the frequency conversion diffuser barrel, the follow-up amortization of being convenient for has improved the efficiency of amortization.
Preferably, the first variable frequency diffuser 110 and the second variable frequency diffuser 120 have the same structure, and further preferably, the first variable frequency diffuser 110 and the second variable frequency diffuser 120 are arranged in parallel.
The first variable frequency diffuser 110 comprises a first variable frequency diffuser cylinder 111 and a first variable frequency diffuser diversion cone 113, the first variable frequency diffuser cylinder 111 is a hollow circular cylinder, a plurality of first variable frequency diffuser air outlet holes 112 used for discharging gas are formed in the surface of the cylinder, and the plurality of first variable frequency diffuser air outlet holes 112 are through holes penetrating through the circular cylinder; first frequency conversion diffuser water conservancy diversion awl 113 is the cone type, first frequency conversion diffuser water conservancy diversion awl 113's conical surface set up in inside the circular cylinder, first frequency conversion diffuser water conservancy diversion awl 113's bottom excircle diameter with the internal diameter of circular cylinder is the same, first frequency conversion diffuser water conservancy diversion awl 113's bottom excircle with a circular cylinder terminal surface fixed connection will the one end of first frequency conversion diffuser barrel 130 is sealed.
The second variable frequency diffuser 120 comprises a second variable frequency diffuser cylinder 121 and a second variable frequency diffuser diversion cone 123, the second variable frequency diffuser cylinder 121 is a hollow circular cylinder, a plurality of second variable frequency diffuser air outlet holes 122 used for discharging gas are formed in the surface of the cylinder, and the plurality of second variable frequency diffuser air outlet holes 122 are through holes penetrating through the circular cylinder; the second variable frequency diffuser guide cone 123 is a cone, the conical surface of the second variable frequency diffuser guide cone 123 is arranged inside the circular cylinder, the diameter of the excircle at the bottom of the second variable frequency diffuser guide cone 123 is the same as the inner diameter of the circular cylinder, the excircle at the bottom of the second variable frequency diffuser guide cone 123 is fixedly connected with one end face of the circular cylinder, and one end of the second variable frequency diffuser cylinder 230 is closed.
On the radial section of the first variable frequency diffuser 110 and the second variable frequency diffuser 120, the cross section of the first variable frequency diffuser cylinder 111 is a first circle, which is defined as a first circle, and the cross section of the second variable frequency diffuser cylinder 121 is a second circle, which is defined as a second circle, from the center O of the first circle1Respectively making a first tangent L of the first frequency conversion diffuser tangent to the second circle towards the second circle11And a second tangent L of the first variable-frequency diffuser12A first tangent line L of the first frequency conversion diffuser11And a second tangent L of the first variable-frequency diffuser12Included angle of (a) is a first variable frequency diffuser cutting angle theta1The cutting angle theta of the first variable-frequency diffuser1Corresponding part S on the first variable frequency diffuser cylinder 1111The air outlet hole 112 of the first variable frequency diffuser is not formed; correspondingly, from the center O of the second circle2Respectively making first tangent lines L of second frequency conversion diffusers tangent to the first circle21And a second tangent L of the second variable frequency diffuser22A first tangent line L of the second variable frequency diffuser21And a second tangent L of the second variable frequency diffuser22Included angle of the second variable frequency diffuser is a cutting angle theta2The cutting angle theta of the second variable frequency diffuser2Corresponding part S on the second variable frequency diffuser cylinder 1212The second variable frequency diffuser outlet hole 122 is not provided. Therefore, the gas discharged from the first variable frequency diffuser gas outlet 112 of the first variable frequency diffuser 110 does not generate impact on the second variable frequency diffuser cylinder 121, and similarly, the gas discharged from the second variable frequency diffuser gas outlet 122 of the second variable frequency diffuser 120 does not generate impact on the first variable frequency diffuser cylinder 111, even if the gas discharged from the first variable frequency diffuser gas outlet 112 of the first variable frequency diffuser 110 and the gas discharged from the second variable frequency diffuser gas outlet 122 of the second variable frequency diffuser 120 have few parts which can generate collision, the collision does not generate secondary noise pollution.
Preferably, the aperture ratio of the variable frequency diffuser air outlet of each variable frequency diffuser is 30% -65%, the flow velocity of the air flow passing through the variable frequency diffuser air outlet is reduced by improving the aperture ratio of the variable frequency diffuser air outlet of each variable frequency diffuser, and the noise of the flowing gas is reduced along with the reduction of the flow velocity of the flowing gas, so that the original noise level of the air flow in the silencing tower is reduced, and the silencing difficulty is reduced.
Preferably, in each variable frequency diffuser, the sum of the areas of the air outlet holes of the variable frequency diffuser is larger than the cross-sectional area of the cylinder body of the variable frequency diffuser, further preferably, in each variable frequency diffuser, the sum of the areas of the air outlet holes of the variable frequency diffuser is at least 1.1 times of the cross-sectional area of the cylinder body of the variable frequency diffuser, the flow velocity of air flow passing through the air outlet holes of the variable frequency diffuser is reduced by increasing the sum of the areas of the air outlet holes of the variable frequency diffuser, and the noise of flowing gas is reduced along with the reduction of the flow velocity of the flowing gas, so the original noise level of the air flow in the silencing tower.
Preferably, a plurality of variable frequency diffusers are arranged in parallel.
Preferably, the tower body 130 is a reinforced concrete structure or a steel frame structure.
The silencer plate assembly, the installation method of the silencer plate assembly, the connection method of the silencer plate assembly and the tower body, and the connection method of the variable-frequency diffuser and the tower body in the application are the prior art, and refer to the prior applications CN201420056662.6, CN201420056663.0, and CN201420057351.1 of the applicant specifically.
The working process of the engine test bed of the invention is as follows:
the gas source 40 delivers the gas required by each test stand through the inlet channel 11 of the 1# engine test stand, the inlet channel 21 of the 2# engine main test stand and the inlet channel 31 of the 2# engine auxiliary test stand to the 1# engine test stand 10, the 2# engine main test stand 20 and the 2# engine auxiliary test stand 30, the surplus gas enters the silencer 100 through the gas discharge pipeline 42, and the gas discharged from the 1# engine test stand and the 2# engine auxiliary test stand respectively enters the exhaust main pipeline 50 through the exhaust pipeline 12 of the 1# engine test stand and the exhaust pipeline 3 of the 2# engine test stand and enters the silencer 100;
the gas exhausted from the main exhaust pipeline 20 of the 2# engine test bed enters the shell of the demister 210 through the gas inlet 213, the gas flow enters the baffle plate demister 211 at the flow rate of 3m/s-6m/s, the baffle plate demister 211 divides the gas flow into a plurality of single-stranded flow channels through the baffle plate 2111, oil drops collide on the baffle plate 2111 through changing the direction of the gas flow and the inertia effect, the oil drop film moves forwards to the barb and is separated, and after the oil drops of 20um-50um carried in the gas flow are removed, the oil drops of 5um-20um and the liquid drops are separated through the wire mesh demister 212; however, the combined demister of the baffle plate demister 211 and the wire mesh demister 212 in the demister 210 does not effectively remove oil droplets below 5um, and therefore, the gas outlet of the demister 210 is connected to the activated carbon adsorption device 220 through the pipeline 230, and the gas discharged from the gas outlet of the demister 210 adsorbs organic waste gas through fine pores of activated carbon, so that the gas discharged reaches the emission standard and then is merged into the main exhaust pipeline 50 to enter the silencer;
the gas discharged from the gas discharge pipeline 40 and the main gas discharge pipeline 50 enters from the end face of one open end of the cylinder of the variable-frequency diffuser through pipelines, is guided by a guide cone of the variable-frequency diffuser and is discharged from a plurality of gas outlet holes of the variable-frequency diffuser, the noise frequency of the gas flow is shifted to high frequency through the gas outlet holes of the dry variable-frequency diffuser, and the difficulty of noise control is reduced by utilizing the principle that the high frequency is easier to eliminate noise than the low frequency; the gas discharged from the gas outlet holes of the variable-frequency diffusers is discharged from the outlet at the top of the tower body after being silenced and denoised by the staggered gas flow channels formed by 3 layers of silencing plate assemblies.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. An engine test bed is characterized by comprising a 1# engine test bed, a 2# engine main test bed, a 2# engine auxiliary test bed, an air source, a vertical oil-gas separation device and a silencing device;
the air supply end of the air source is respectively communicated with an air inlet channel of a 1# engine test bed, an air inlet channel of a 2# engine main test bed and an air inlet channel of a 2# engine auxiliary test bed through an air source main pipeline; the air discharging end of the air source is communicated with one end of an air discharging pipeline, and the other end of the air discharging pipeline is communicated with a silencing device;
two ends of the vertical oil-gas separation device are respectively communicated with a main exhaust pipeline outlet and an exhaust main pipeline inlet of a No. 2 engine test bed; the exhaust pipeline of the 1# engine test bed and the secondary exhaust pipeline of the 2# engine test bed are arranged in parallel and are communicated with the inlet of the main exhaust pipeline; the outlet of the main exhaust pipeline is communicated with a silencing device;
the vertical oil-gas separation device comprises a demister and an active carbon adsorption device; the gas outlet of the demister is communicated with the gas inlet of the active carbon adsorption device through a gas conveying pipeline;
the demister comprises a shell formed by sequentially connecting an upper end enclosure, a shell section and a lower end enclosure, an air inlet is formed in the lower portion of the shell section and is communicated with an outlet of an exhaust pipeline of a second engine test bed, and a gas outlet of the demister is formed in the top of the upper end enclosure;
a baffle plate demister is arranged above the air inlet in the cylinder section, a wire mesh demister is arranged at the top in the cylinder section, and the wire mesh demister is positioned above the baffle plate demister; a spraying and washing device is arranged on the side wall of the shell section; a liquid outlet is arranged at the bottom of the lower end enclosure;
the activated carbon adsorption device comprises an activated carbon box body which is horizontally arranged; along the flowing direction of gas discharged from a gas outlet of the demister, a vertical activated carbon adsorption tank and a horizontal activated carbon adsorption tank are sequentially arranged in an activated carbon box body, the activated carbon box body is provided with a gas outlet, and the gas outlet of the activated carbon box body is communicated with a silencing device through a pipeline; meanwhile, the bottom of the activated carbon box body is provided with a liquid outlet of the activated carbon adsorption device.
2. The apparatus of claim 1, wherein the silencer assembly includes a tower body, a silencer assembly, and 2 variable frequency diffusers, each variable frequency diffuser being identical in construction;
each variable frequency diffuser comprises a variable frequency diffuser cylinder and a variable frequency diffuser diversion cone, the variable frequency diffuser cylinder is a hollow circular cylinder, a plurality of variable frequency diffuser air outlet holes are formed in the surface of the cylinder, and the variable frequency diffuser air outlet holes are through holes penetrating through the circular cylinder; the variable-frequency diffuser flow guide cone is cone-shaped, the conical surface of the variable-frequency diffuser flow guide cone is arranged in the circular cylinder, and the excircle at the bottom of the variable-frequency diffuser flow guide cone is fixedly connected with one end face of the circular cylinder;
in each variable-frequency diffuser, the projection of the air outlet hole of the variable-frequency diffuser along the axis direction of the variable-frequency diffuser is not on the cylinder body of the variable-frequency diffuser adjacent to the variable-frequency diffuser;
the outlet of the main exhaust pipeline is communicated with a silencing device; the air discharge pipeline is communicated with the silencing device; the air discharge pipeline is communicated with one variable-frequency diffuser, and the outlet of the main exhaust pipeline is communicated with the other variable-frequency diffuser.
3. The apparatus of claim 1, wherein the spray rinsing device comprises a first spray rinsing device, a second spray rinsing device, a third spray rinsing device, and a fourth spray rinsing device.
4. The apparatus of claim 1, wherein the baffle demister comprises a baffle plate and a barb, the barb being disposed at a bend of the baffle plate.
5. The apparatus of claim 4 wherein the baffled demister comprises a plurality of baffle plates.
6. The apparatus of claim 2, wherein: the aperture ratio of the outlet hole of the variable frequency diffuser of each variable frequency diffuser is 30-65%.
7. The apparatus of claim 2, wherein: in each variable frequency diffuser, the sum of the areas of the air outlet holes of the variable frequency diffuser is larger than the cross-sectional area of the cylinder body of the variable frequency diffuser.
8. The apparatus of claim 7, wherein: in each variable frequency diffuser, the sum of the areas of the air outlet holes of the variable frequency diffuser is at least 1.1 times of the cross-sectional area of the cylinder body of the variable frequency diffuser.
9. The apparatus of claim 2, wherein: a plurality of variable frequency diffusers are arranged in parallel.
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| CN202011572215.2A CN112729840A (en) | 2020-12-28 | 2020-12-28 | Engine test bed |
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| CN202011572215.2A CN112729840A (en) | 2020-12-28 | 2020-12-28 | Engine test bed |
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Cited By (1)
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| CN113865878A (en) * | 2021-12-01 | 2021-12-31 | 中国飞机强度研究所 | Large-discharge-quantity waste gas silencing and discharging device and method for airplane engine driving test |
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