A device for generating pulsating backpressure in an inlet test
A technology for generating devices and air inlets, applied in aerodynamic tests, measuring devices, jet engine tests, etc., can solve problems such as inability to simulate real conditions, and achieve the effect of low motor speed
Active Publication Date: 2019-02-05
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
[0006] When the scramjet engine is actually working, the pressure pulsation frequency ranges from tens to 200 Hz in the combustion chamber, and the pulsation backpressure frequency that can be generated by the existing technology is less than this range. figure 1 The shown technique can only generate a pulsating backpressure of a few Hertz, figure 2 The technique shown produces a pulsating back pressure of less than 100 Hz and therefore cannot simulate real conditions
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[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0034] refer to image 3 with Figure 4 In this embodiment, a device for generating pulsating backpressure in an air inlet test includes a throttle rotary vane 1 installed outside the outlet of a wind tunnel and a drive mechanism for driving the throttle rotary vane 1 to rotate, and the throttle rotary vane 1 includes 2 More than one piece of rotary vane 2, the throttle rotary vane 1 rotates under the drive of the driving mechanism, and each rotary vane 2 can block a certain area of the wind tunnel outlet in turn to generate throttling during the rotation process. The driving mechanism of the present invention includes a frequency conversion motor and a frequency converter. The central shaft sleeve of the throttle rotary plate is connected to the drive shaft of the frequency conversion motor. The frequency conversion motor is connected to a ...
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The invention discloses an apparatus for generating fluctuating counter pressure in an air inlet test. The apparatus includes a throttle rotary vane which is mounted on the outside of a wind tunnel outlet and a drive mechanism which drives the throttle rotary vane to rotate. The throttle rotary vane includes more than 2 rotary vanes and is driven by the drive mechanism to rotate. Each rotary vane, when rotating, can alternatively block a certain area of the wind tunnel outlet so as to generate a throttle. Compared with throttle blockage cones and rotation ellipse methods of prior art, according to the invention, the apparatus can generate a fluctuating counter pressure signal of higher frequency and having adjustable time-average value, vibration and frequency. Also, according to the invention, to generate a fluctuating counter pressure signal of the same frequency requires less rotation speed of the motor.
Description
technical field [0001] The invention relates to the field of air inlet wind tunnel tests, in particular to a pulsating back pressure generating device. Background technique [0002] The scramjet engine is mainly composed of intake port-isolating section, combustion chamber and tail nozzle. The intake-isolating section is an important compression part of the engine, and its downstream is connected to the combustion chamber. In the actual working process of the engine, there is combustion oscillation or combustion instability in the combustion chamber, which causes the pressure of the combustion chamber to fluctuate at a certain frequency and amplitude. Therefore, in the test of the influence of back pressure on the intake port-isolation section, it is necessary to simulate the pulsating back pressure . [0003] At present, there are mainly two ways to generate pulsating back pressure: [0004] (1) The throttling device (such as throttling cone, etc.) is controlled by the mo...
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IPC IPC(8): G01M15/14G01M9/00
CPCG01M9/00G01M15/14
Inventor 熊冰范晓樯王振国陶渊赵健周鑫
Owner NAT UNIV OF DEFENSE TECH