A small flow rate flow parameter accurate simulation test bench

Abstract

A small flow rate incoming flow parameter accurate simulation test bench, gas source, air intake pipe, combustion device, exhaust system, particle loading system; the gas source, air intake pipe, combustion device and exhaust system are connected in sequence through pipelines; the particle loading system is connected to the inlet of the combustion device through pipelines. The small flow rate incoming flow parameter accurate simulation test bench of the present invention, before the test, the tracer particles that meet the particle size requirements are placed in the particle loading body; the floating particles are added to the flowing main airflow, and after connecting to the experimental device, a gas flow that meets the velocity field measurement requirements is formed, thereby realizing the accurate simulation of the small flow rate incoming flow parameters.

Description

Technical Field

[0001] The invention relates to the technical field of test bench testing, and in particular to a small flow parameter accurate simulation test bench. Background Art

[0002] A small flow rate incoming flow parameter precise simulation test bench is an important component of the test bench. However, in the prior art, there is no effective small flow rate incoming flow parameter precise simulation test bench to achieve small flow rate incoming flow parameter precise simulation. At the same time, there is no particle loading device that can accurately and effectively control the mass flow rate of particles. At the same time, it is impossible to form an effective closed-loop control system. In addition, the test state cannot be effectively observed. Therefore, for the precise simulation of small flow rate incoming flow parameters, there is an urgent need for a particle loading device that can accurately and effectively control the mass flow rate of particles to form an effective closed-loop control system and a small flow rate incoming flow parameter precise simulation test bench. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and to provide a small flow parameter accurate simulation test bench.

[0004] The technical solution of the present invention is:

[0005] A small flow parameter accurate simulation test bench comprises an air source, an air intake pipe, a combustion device, an exhaust system and a particle loading system. The air source, the air intake pipe, the combustion device and the exhaust system are connected in sequence through pipelines. The particle loading system is connected to the inlet of the combustion device through pipelines.

[0006] Furthermore, the test bench includes a pressure stabilizing device and a flow control device. The pressure stabilizing device is located between the air source and the air intake pipe and is connected to the air source and the air intake pipe through a pipeline; the flow control device is located between the air intake pipe and the combustion device and is connected to the air intake pipe and the combustion device through a pipeline.

[0007] Furthermore, the test bench includes a switching device, which is located between the flow control device and the combustion device and is connected to the flow control device and the combustion device through a pipeline. The switching device includes an air intake inlet and an exhaust outlet. The air intake inlet is connected to the outlet of the flow control device through a pipeline, one exhaust outlet of the switching device is connected to the combustion device, and the other exhaust outlet of the switching device is connected to the exhaust system.

[0008] Furthermore, the test bench includes a stop valve, a mass flow meter and an electric valve; the stop valve, the mass flow meter and the electric valve are located between the particle loading system and the inlet of the combustion device and are connected to the particle loading system and the inlet of the combustion device through a pipeline. Along the direction from the particle loading system to the inlet of the combustion device, the stop valve, the mass flow meter and the electric valve are arranged in sequence.

[0009] Furthermore, the test bench includes a first pressure measuring point, a second pressure measuring point, a third pressure measuring point, a fourth pressure measuring point, a fifth pressure measuring point and a temperature measuring point. The first pressure measuring point is located on the pipeline between the pressure stabilizing device and the intake pipe, the second pressure measuring point is located on the pipeline between the intake pipe and the flow control device, the third pressure measuring point is located on the pipeline between the flow control device and the switching device, the fourth pressure measuring point is located on the pipeline between the switching device and the inlet of the combustion device, the fifth pressure measuring point is located on the pipeline between the stop valve and the mass flow meter, and the temperature measuring point is located on the pipeline between the fifth pressure measuring point and the mass flow meter; the first pressure measuring point, the second pressure measuring point, the third pressure measuring point, the fourth pressure measuring point, the fifth pressure measuring point and the temperature measuring point are respectively provided with a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a fifth pressure sensor and a temperature sensor.

[0010] Furthermore, the particle loading system includes a hopper, particles, a glass conduit, a dust flowmeter, a pressure reducing valve, a venting solenoid valve, a discharge valve and an air source for the particle loading device; the air source for the particle loading device is connected to the pressure reducing valve, and the outlet of the pressure reducing valve is connected to the hopper and the venting solenoid valve respectively through pipelines; the hopper includes a hopper body, a hopper upper cover is arranged on the hopper body, a particle pressing plate is arranged in the hopper body, the particles are placed in the hopper body and are located between the outlet of the hopper body and the particle pressing plate; the outlet of the hopper body is connected to the glass conduit, and a dust flowmeter and a discharge valve are arranged in sequence on the glass conduit along the flow direction of the particles.

[0011] Furthermore, a gap is provided between the particle pressing plate and the inner wall of the hopper body or a small hole is provided on the particle pressing plate.

[0012] Furthermore, the test bench includes a front-end conveying device, a rear-end exhaust device, and a test bench; the glass tube is inserted into the air intake pipe, the air intake pipe, the front-end conveying device, the combustion device, and the rear-end exhaust device are connected in sequence, and the combustion device is placed on the test bench.

[0013] Furthermore, the internal aerodynamic profiles of the front-end conveying device and the rear-end discharge device are Laval nozzle structures, and quartz glass windows are provided on the sides of the front-end conveying device and the rear-end discharge device.

[0014] Furthermore, the position where the glass conduit is inserted into the center line of the air intake pipe is located at the upper part of the air intake pipe.

[0015] The advantages of the present invention compared with the prior art are:

[0016] 1. The small flow rate incoming flow parameter accurate simulation test bench of the present invention, before the test, the tracer particles that meet the particle size requirements are placed in the particle loading body; the floating particles are added to the flowing main airflow, and after connecting to the experimental device, a gas flow that meets the velocity field measurement requirements is formed, thereby realizing the accurate simulation of the small flow rate incoming flow parameters.

[0017] 2. The small flow parameter precise simulation test bench of the present invention is provided with a pressure stabilizing device and a flow control device to achieve pressure stability. At the same time, it ensures that the flow entering the combustion chamber meets the predetermined value, thereby improving the accuracy of the overall test bench.

[0018] 3. The small flow parameters of the present invention are accurately simulated on the test bench. During the test, when the state of the intake path is unstable, the gas in the intake path is switched to the bypass through the switching device, and the intake air directly enters the exhaust system without passing through the combustion device, thereby reducing the load and damage to the combustion device.

[0019] 4. The small flow rate inlet flow parameter accurate simulation test bench of the present invention realizes the switching of particle input and mass measurement and flow control by setting a stop valve, a mass flow meter and an electric valve, thereby improving the accuracy and test width of the entire test bench.

[0020] 5. The small flow parameter precise simulation test bench of the present invention realizes pressure measurement of each node by setting a first pressure measuring point, a second pressure measuring point, a third pressure measuring point, and a fourth pressure measuring point in the gas circuit and setting pressure sensors at the corresponding pressure measuring points, so as to ensure that the pressure entering the combustion chamber meets the predetermined pressure, thereby ensuring the intake accuracy of the test bench.

[0021] 5. The small flow rate incoming flow parameter precise simulation test bench of the present invention realizes the pressure and temperature measurement of the incoming flow particles by setting the fifth pressure measuring point and temperature measuring point in the particle input path, thereby ensuring that the pressure and temperature of the incoming flow particles meet the predetermined values, thereby ensuring the air intake accuracy of the test bench.

[0022] 7. The small flow parameter accurate simulation test bench of the present invention first determines the inner diameter of the glass conduit according to the particle flow rate, and then the pressure in the hopper is adjusted and controlled by the pressure reducing valve and the air release solenoid valve. A dust mass flowmeter is set on the glass conduit to form a closed-loop control system.

[0023] 8. The small flow parameters of the present invention accurately simulate the test bench, a gap is left between the particle pressing plate and the edge of the hopper or a small hole is opened in the particle pressing plate to control a small amount of air to enter the particles.

[0024] 9. In the small flow rate parameter accurate simulation test bench of the present invention, the outlet of the glass conduit is located at the upper part of the center line of the intake pipe, and the distance between them is controlled to control the distribution of particles on the cross section of the intake pipe.

[0025] 10. The small flow parameter accurate simulation test bench of the present invention sets the combustion device as a transparent structure. At the same time, quartz glass windows are set on the sides of the front-end conveying device and the rear-end exhaust device to realize the observation of the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the principle of the small flow parameter accurate simulation test bench of the present invention.

[0027] Figure 2 Schematic diagram of the particle loading device in the small flow parameter accurate simulation test bench of the present invention DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1-2 As shown, a small flow rate incoming flow parameter accurate simulation test bench comprises an air source 50, an air intake pipe 21, a combustion device 24, an exhaust system 60, and a particle loading system 10; the air source 50, the air intake pipe 21, the combustion device 24, and the exhaust system 60 are sequentially connected through pipelines; the particle loading system 10 is connected to the inlet of the combustion device 24 through pipelines. In the small flow rate incoming flow parameter accurate simulation test bench of the present invention, before the test, tracer particles meeting the particle size requirements are placed in the particle loading body; the floating particles are added to the flowing main airflow, and after being connected to the experimental device, a gas flow meeting the velocity field measurement requirements is formed, thereby realizing the accurate simulation of small flow rate incoming flow parameters.

[0031] Preferably, the small flow rate incoming flow parameter accurate simulation test bench includes a pressure stabilizing device 26 and a flow control device 27. The pressure stabilizing device 26 is located between the gas source 50 and the intake pipe 21 and is connected to the gas source 50 and the intake pipe 21 through a pipeline; the flow control device 27 is located between the intake pipe 21 and the combustion device 24 and is connected to the intake pipe 21 and the combustion device 24 through a pipeline. By providing the pressure stabilizing device and the flow control device, the pressure is stabilized, and at the same time, the flow entering the combustion chamber is ensured to meet the predetermined value, thereby improving the accuracy of the overall test bench.

[0032] Preferably, the small flow parameter accurate simulation test bench includes a switching device 28, which is located between the flow control device 27 and the combustion device 24 and is connected to the flow control device 27 and the combustion device 24 through a pipeline, and the switching device 28 includes an intake inlet and two exhaust outlets, the intake inlet is connected to the outlet of the flow control device 27 through a pipeline, one exhaust outlet of the switching device 28 is connected to the combustion device 24, and the other exhaust outlet of the switching device 28 is connected to the exhaust system 60. During the test, when the state of the intake path is unstable, the gas in the intake path is switched to the bypass through the switching device, and the intake air directly enters the exhaust system without passing through the combustion device, thereby reducing the load and damage to the combustion device.

[0033] Preferably, the small flow rate inlet parameter accurate simulation test bench includes a stop valve 47, a mass flow meter 48 and an electric valve 49; the stop valve 47, the mass flow meter 48 and the electric valve 49 are located between the particle loading system 10 and the inlet of the combustion device 24 and are connected to the particle loading system 10 and the inlet of the combustion device 24 through a pipeline. The stop valve 47, the mass flow meter 48 and the electric valve 49 are arranged in sequence along the direction from the particle loading system 10 to the inlet of the combustion device 24. By setting the stop valve, the mass flow meter and the electric valve, the switch of the particle input and the mass measurement and flow control are realized, thereby improving the accuracy and test width of the entire test bench.

[0034] Preferably, the small flow rate incoming flow parameter precise simulation test bench includes a first pressure measuring point, a second pressure measuring point, a third pressure measuring point, a fourth pressure measuring point, a fifth pressure measuring point and a temperature measuring point. The first pressure measuring point is located on the pipeline between the pressure stabilizing device 26 and the intake pipe 21, the second pressure measuring point is located on the pipeline between the intake pipe 21 and the flow control device 27, the third pressure measuring point is located on the pipeline between the flow control device 27 and the switching device 28, the fourth pressure measuring point is located on the pipeline between the switching device 28 and the inlet of the combustion device 24, the fifth pressure measuring point is located on the pipeline between the stop valve 47 and the mass flow meter 48, and the temperature measuring point is located on the pipeline between the fifth pressure measuring point and the mass flow meter 48; the first pressure measuring point, the second pressure measuring point, the third pressure measuring point, the fourth pressure measuring point, the fifth pressure measuring point and the temperature measuring point are respectively provided with a first pressure sensor 41, a second pressure sensor 42, a third pressure sensor 43, a fourth pressure sensor 44, a fifth pressure sensor 45 and a temperature sensor 46. By setting the first pressure measuring point, the second pressure measuring point, the third pressure measuring point, and the fourth pressure measuring point in the gas path, and setting pressure sensors at the corresponding pressure measuring points, the pressure measurement of each node is realized to ensure that the pressure entering the combustion chamber meets the preset pressure, thereby ensuring the intake accuracy of the test bench. By setting the fifth pressure measuring point and the temperature measuring point in the particle input path, the pressure and temperature of the incoming flow particles are measured, thereby ensuring that the pressure and temperature of the incoming flow particles meet the preset values, thereby ensuring the intake accuracy of the test bench.

[0035] Preferably, the particle loading system 10 comprises a hopper 1, particles 4, a glass conduit 5, a dust flowmeter 6, a pressure reducing valve 7, a deflation solenoid valve 8, a discharge valve 9 and a particle loading device air source 30; the particle loading device air source 30 is connected to the pressure reducing valve 7, and the outlet of the pressure reducing valve 7 is respectively connected to the hopper 1 and the deflation solenoid valve 8 through a pipeline; the hopper 1 comprises a hopper body, a hopper upper cover 2 is arranged on the hopper body, a particle pressing plate 3 is arranged in the hopper body, and the particles 4 are placed in the hopper body and located between the outlet of the hopper body and the particle pressing plate 3; the outlet of the hopper body is connected to the glass conduit 5, and the dust flowmeter 6 and the discharge valve 9 are arranged on the glass conduit 5 in sequence along the flow direction of the particles. The particle loading system 10 first determines the inner diameter of the glass conduit according to the particle flow rate, and then adjusts and controls the pressure in the hopper by the pressure reducing valve and the deflation solenoid valve, and a dust mass flowmeter is arranged on the glass conduit, thereby forming a closed-loop control system.

[0036] Preferably, it comprises a front-end conveying device 22, a rear-end discharge device 23, and a test bench 25; the glass conduit 5 is inserted into the air inlet pipe 21, the air inlet pipe 21, the front-end conveying device 22, the combustion device 24, and the rear-end discharge device 23 are connected in sequence, and the combustion device is placed on the test bench 25.

[0037] Preferably, a gap is provided between the particle pressing plate 3 and the inner wall of the hopper body or a small hole is provided on the particle pressing plate 3, so as to control a small amount of air from entering the particles.

[0038] Preferably, the inner wall of the glass tube 5 is a smooth surface to facilitate the flow of particles.

[0039] Preferably, the discharge valve 9 is a plug-in type discharge valve.

[0040] Preferably, the combustion device 24 is a rectangular parallelepiped structure made of transparent tempered glass. The internal aerodynamic profiles of the front conveying device 22 and the rear discharge device 23 are Laval nozzle structures, and quartz glass windows are provided on the sides of the front conveying device and the rear discharge device. The combustion device is set as a transparent structure, and at the same time, quartz glass windows are provided on the sides of the front conveying device and the rear discharge device, so that the observation of the test device is realized.

[0041] Preferably, the position where the glass conduit 5 is inserted into the air intake pipe 21 is located above the center line of the air intake pipe, and the distance between them is controlled to control the distribution of particles on the cross section of the air intake pipe.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0043] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A small flow rate flow parameter accurate simulation test bench, characterized in that: Air source, air intake pipe, combustion device, exhaust system, particle loading system; The gas source, the air inlet pipe, the combustion device and the exhaust system are connected in sequence through pipelines; the particle loading system is connected to the inlet of the combustion device through the pipeline; The test bench also includes a pressure stabilizing device and a flow control device. The pressure stabilizing device is located between the air source and the air inlet pipe and is connected to the air source and the air inlet pipe through a pipeline. The flow control device is located between the air inlet pipe and the combustion device and is connected to the air inlet pipe and the combustion device through a pipeline. The particle loading system comprises a hopper, particles, a glass conduit, a dust flowmeter, a pressure reducing valve, a venting solenoid valve, a discharge valve and an air source for a particle loading device; the air source for the particle loading device is connected to the pressure reducing valve, and an outlet of the pressure reducing valve is respectively connected to the hopper and the venting solenoid valve through pipelines; the hopper comprises a hopper body, a hopper upper cover is arranged on the hopper body, a particle pressing plate is arranged in the hopper body, the particles are placed in the hopper body and are located between the outlet of the hopper body and the particle pressing plate; the outlet of the hopper body is connected to the glass conduit, and a dust flowmeter and a discharge valve are arranged in sequence on the glass conduit along the flow direction of the particles.

2. The test bench according to claim 1, characterized in that: The switching device includes a switching device, which is located between the flow control device and the combustion device and is connected to the flow control device and the combustion device through a pipeline. The switching device includes an air intake inlet and two exhaust outlets. The air intake inlet is connected to the outlet of the flow control device through a pipeline, one exhaust outlet of the switching device is connected to the combustion device, and the other exhaust outlet of the switching device is connected to the exhaust system.

3. The test bench according to claim 2, characterized in that: It includes a stop valve, a mass flow meter and an electric valve; the stop valve, the mass flow meter and the electric valve are located between a particle loading system and an inlet of a combustion device and are connected to the particle loading system and the inlet of the combustion device through a pipeline. The stop valve, the mass flow meter and the electric valve are arranged in sequence along the direction from the particle loading system to the inlet of the combustion device.

4. The test bench according to claim 3, characterized in that: It includes a first pressure measuring point, a second pressure measuring point, a third pressure measuring point, a fourth pressure measuring point, a fifth pressure measuring point and a temperature measuring point. The first pressure measuring point is located on the pipeline between the pressure stabilizing device and the intake pipe, the second pressure measuring point is located on the pipeline between the intake pipe and the flow control device, the third pressure measuring point is located on the pipeline between the flow control device and the switching device, the fourth pressure measuring point is located on the pipeline between the switching device and the inlet of the combustion device, the fifth pressure measuring point is located on the pipeline between the stop valve and the mass flow meter, and the temperature measuring point is located on the pipeline between the fifth pressure measuring point and the mass flow meter; the first pressure measuring point, the second pressure measuring point, the third pressure measuring point, the fourth pressure measuring point, the fifth pressure measuring point and the temperature measuring point are respectively provided with a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a fifth pressure sensor and a temperature sensor.

5. The test bench according to claim 1, characterized in that: A gap is arranged between the particle pressing plate and the inner wall of the hopper body, or a small hole is opened on the particle pressing plate.

6. The test bench according to claim 1, characterized in that: The invention comprises a front-end conveying device, a rear-end discharging device and a test bench; a glass catheter is inserted into an air inlet pipe, and the air inlet pipe, the front-end conveying device, the combustion device and the rear-end discharging device are connected in sequence, and the combustion device is placed on the test bench.

7. The test bench according to claim 6, characterized in that: The internal aerodynamic profiles of the front-end conveying device and the rear-end discharge device are Laval nozzle structures, and quartz glass windows are arranged on the sides of the front-end conveying device and the rear-end discharge device.

8. The test bench according to claim 1, characterized in that: The position where the glass tube is inserted into the center line of the intake pipe is located at the upper part of the intake pipe.

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