| Abstract: | An experimental and theoretical investigation has been made of nonsteady heat transfer between a shield and a hot turbulent jet impinging normally on it. A system of dimensionless parameters is found for simulating the nonsteady interaction of high-temperature jets with shields. A system of thermocouples was used to measure the spatial and temporal distributions of the temperature in a gas above a shield, and also on the surface and within the shield. A numerical investigation was made of the nonsteady heat transfer in a shield with boundary condition specified in the form of the experimental temperature distribution of the front surface of the shield and with allowance for convective and radiative loss of heat from the other surfaces of the shield. The obtained solution is used to find the characteristics of nonsteady heat transfer (the coefficient of heat transfer and the Stanton number) on the front surface of the shield. These characteristics are used to solve the problem of periodic exposure of a shield to a heat flow produced by the  switching on of a high-temperature jet.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 2, pp. 130–138, March–April, 1979. |
