Abstract
The temperature and the pressure distributions on a plate in the dual underexpanded impinging jets are experimentally and numerically studied in this paper. The experiments were performed by measuring the adiabatic wall temperature using an infrared imaging camera, wall static pressures and by visualizing density fields using schlieren method. Numerical calculations were also conducted by solving three dimensional compressible thin layer Navier-Storkes equatons . The main parameters for the dual jets are the nondimensional distance between the two nozzle centers H/D covering 1.5, 2.0, the nozzle to plate separation L/D 2.0, 3.0 ,4.0 and 5.0 and the pressure ratio defined by p_0/p_b 1.0〜6.0, where D is the diameter of each nozzle exit, p_0the stagnation pressure and p_b the back pressure. It is found that the agreement between the two jets is observed both in the experiments and the calculation. Moreover, the flow separation near the plate is predicted by the calculations.
