Effect of thermal stress on supersonic nozzle structure
The supersonic nozzle is an import part of wind tunnel to obtain the flow field with designed Mach number.In this paper,the nozzle is used in high-speed free jet wind tunnel for engine test with high temperature and pressure air as working medium; the exit diameter of nozzle is Φ 1.5 m,and the Mach number is 4.0; the design temperature is 930 k and the design pressure is 2.3 MPa.To prevent thermal deformation of nozzle body in high temperature flow field,the cooling problem must be considered in the design of nozzle.Usually,the thick shell is adopted in the traditional structure design of nozzle; the jackets of cooling water are connecting with each other,and the high pressure cooling water enters the jackets through a common inlet and leaves the jackets in a common outlet.When this kind of structure is used under the pressure of 2.3 MPa,the maximum flow temperature can’t be more than 637k,and the thermal stress concentration appears in the root of flange.In the present nozzle design with the flow temperature of 930k under the pressure of 2.3 MPa,the thermal stresses of the nozzle with the traditional structure are more than 900 MPa inside the surface far beyond the allowable stress of material.This paper describes a kind of new structure design for the nozzle considering the effect of thermal stress,where the thin shell is used,and the cooling water enters the nozzle jacket through independent channels.Calculated by engineering and Ansys methods,the structure parameters of the nozzle are optimized,and the thermal stresses are reduced to the allowable stress range of material,thus the problem of the thermal deformation on the nozzle structure caused by the thermal stress is solved.
thermal stress supersonic nozzle high temperature cooling water
Bu Junhui Chen ding Shen Fengjing Sun Yongtang Sun tao
China Academy of Aerospace Aerodynamics,100074,Beijing,China
国际会议
10th International Congress on Thermal Stresses(第十届国际热应力大会(TS2013))
南京
英文
1-4
2013-05-31（万方平台首次上网日期，不代表论文的发表时间）