Research On Wave Rotor Flow Channel Design And Its Impact On Cooling Performance

This paper analyzes and studies the gas wave refrigerator.In this structure,the wave rotor as the core component plays a decisive role in the working efficiency,working life and overall size of the gas wave machine.In the analysis,the axial wave rotor is mainly studied.This type of wave rotor is currently widely used.The main applications include the thermal cycle on the top of the gas turbine etc.The strength of the cooling capacity in the current gas wave refrigerator is analyzed.The cooling capacity is measured by the intensity of the shock wave.At the same time,the fatigue life of the wave rotor bezel is studied.A single-tube three-dimensional injection model is established for oscillating tubes with the same cross-sectional area,high width and different dimensions,and a two-dimensional model is used to simplify the calculation of multi-tube calculations.Based on the principles of engineering thermodynamics and gas dynamics,the model is numerically calculated,and the effects of shock gas sweeping through the gas pressure of different structure oscillation tubes and the flow in the tube under the same operating conditions are analyzed and discussed.The fatigue life of is calculated,which belong to the wave rotor bezel,and the maximum height to thickness ratio of the bezel under a certain pressure difference is obtained,which provides theoretical support for the future design of the gas wave machine.The contents of this paper are composed of the following parts:(1)A single-pipe three-dimensional model was established for the calculation of flow channels with different heights and widths under the same cross-sectional area.As is indicated in paper,when the cross-sectional area of the oscillating tube is kept to the constant,the change of the tube height and tube width does not affect the gas flow rate,and the energy loss almost does not change,but there is a lag in energy propagation when the height is low.In general,the higher the height,the higher the energy delivered at the same time.However,the design of the height of the oscillating tube also needs to consider the fatigue life of the separator.(2)The existence of wave rotor baffle and chamfering were studied on the gas flow in the tube.To simplify the calculation,a multi-tube two-dimensional model was established.The smaller the chamfering,the smaller the energy loss and the thickness of the oscillating tube.In terms of machine,there is an optimal size.(3)By analyzing the fatigue life of the separator,it mainly includes the analysis and calculation of the high thickness ratio of the separator,the existence of chamfers and the inclination angle of the separator.The analysis shows that the existence of chamfers on the separator plays a role in enhancing the safety of the separator,and the safety factor of the separator is roughly the same under the same height-to-thickness ratio,with the increase of the pressure,the ratio of height to thickness of the baffle plate shows a decreasing trend,but the decreasing range of the ratio does not change significantly with the multiple of the pressure.When the pressure is 0.35 MPa/0.101 MPa,the maximum ratio of separator height to thickness is 44;when the pressure is 0.7 MPa/0.101 MPa,the maximum ratio of separator height to thickness is 29.