Abstract
The temperature and pressure distributions on a plate in the dual underexpanded impinging jets are experimentally investigated. The static pressure fluctuations on the plate were also measured and compared with the case of the single jet. The main parameters for the experiments are the non-dimensional distance between the two nozzle centers H/D=1.5,2.0,the nozzle to plate separation L/D=2.0,and 5.0,and pressure ratio defined by p_o/p_b=1.0∿6.0. The results show that the temperature at the middle point between the jet axes is considerably affected by the pressure ratio p_o/p__b, where p_o is the stagnation pressure, p_b the back pressure. Moreover, FFT analyses of the static pressure fluctuations on the plate suggest that relatively low frequency range between 0 and 1.5kHz for the dual jets is dominant under the condition of H/D=1.5 and L/D=2.0,and at the pressure ratio of about 3.0 compare to the single jet.
