Air inlet flow pipe, horn mouth and design method of horn mouth

Abstract

The invention designs a design method of an air inlet flow pipe. The method comprises: a straight line section of the air inlet flow pipe and a front lip section of the horn mouth are obtained according to a standard model; wherein the lip front section extends outwards to form a lip rear section, the lip rear section is composed of an arc, and the center of the arc is different from the center ofa prototype lip rear section in a standard model. The invention discloses a horn mouth and a design method. According to the design method for replacing a prototype contour line with a section of arcin the horn mouth of the air inlet flow pipe, the problem that in the prior art, the size of the horn mouth of the air inlet flow pipe is too large is solved, the installation stability and the testaccuracy of an acoustic rotation test rake are guaranteed, and higher reliability is achieved for a fan pressurization level test.

Description

technical field [0001] The application belongs to the technical field of turbine testing, and in particular relates to an intake flow tube, a bell mouth and a design method thereof. Background technique [0002] During the compressor test, the air flow rate is one of the main performance parameters measured by the aerodynamic performance test. Generally, it is necessary to install an intake flow tube at the inlet of the tester to measure the physical flow parameters of the compressor under test, and convert the actual intake atmospheric conditions and standard atmospheric conditions to obtain the converted flow rates of the compressor under different working conditions. [0003] In the fan booster stage test, an acoustic rotating test rake needs to be installed when measuring the noise. The test rake is installed in a ring shape at the bell mouth of the inlet flow tube. The test rake rotates during the test, which requires that the cantilever of the acoustic rotating test ra...

AI Technical Summary

Problems solved by technology

[0008] The existing standard modeling method can well ensure the uniformity of the airflow after entering the flow tube, but when carrying out the sound transmission test before the fan booster stage, it is necessary to arrange the acoustic test rake 2 at the inlet, and the acoustic test rake 2 needs to be along the axis of the compressor 3Rotate and measure

In the design of the bell mouth of the existing prototype flow tube, even if the data of the bell mouth with the smallest radius size (a=0.6D) is selected, the size of the bell mouth is still too large

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