Since the dome experiences the convective heat loading, thermal stress will be generated in the thickness direction Thus, estimation of the thermal shock and analysis of the thermal shock resistance of the dome are the key to the design of the dome In this paper, thermal shock resistance of CVD ZnS dome is analysed based on the flight condition of 6000m altitude and 30 Mach We obtained the critical Reynolds number through a rockets pry experiment, which deduced that there exists a transition from laminar flow to turbulent flow at somewhere over the dome We calculated the heat transfer coefficient over dome through heat transfer coefficient engineering formula of high-speed sphere with turbulent boundary layer near the stagnation point The largest heat transfer coefficient is 2590W/(m2K) Then, we calculated the transient thermal stress of dome by using the finite element method Then we obtained the temperature and thermal stress distribution of different time through the direction of thickness In order to obtain the mechanical properties of CVD ZnS at high temperatures, the 3-point bending method was used to test the flexure strength of CVD ZnS at different temperature When compared the maximum thermal stress with flexure strength at different temperature, we find that the safety factors were not less than 175 The result implied that the dome has good safety margin under the proposed application condition Through the above test and analysis, we can get the conclusion that the thermal shock resistance of the CVD ZnS dome satisfied the requirements of flight conditions

Analysis of thermal shock resistance of CVD ZnS dome

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Analysis of thermal shock resistance of CVD ZnS dome