Accession Number : AD0466625


Title :   SHOCK WAVE STRUCTURE IN A DUSTY ABLATING GAS.


Descriptive Note : Research note,


Corporate Author : HELIODYNE CORP LOS ANGELES CA


Personal Author(s) : Nayfeh, Ali Hasan


Report Date : Jun 1965


Pagination or Media Count : 17


Abstract : The general one-dimensional equations governing the flow of a mixture of a gas and an ablating dust in a constant-area tube are derived taking into account the simultaneous effects of the dust particle drag, convective and radiative heat transfer, and ablation. The pressure, velocity, and temperature in the equilibrium region, i.e., where the dust is completely vaporized, are obtained by neglecting the particle drag, convective and radiative heat transfer. The results show that the driving pressure ratio needed in a shock tube to attain a shock speed of 160,000 cm/sec in a mixture of argon and 10% mass fraction teflon at room temperature is about 50% more than that needed to attain the same shock speed in pure argon. The effect of the presence of the dust on increasing the driving pressure ratio is in qualitative agreement with observations in Heliodyne's shock tube. These results are encouraging so that the relaxation zone will be constructed in the near future by solving the above mentioned equations. (Author)


Descriptors :   DUST , ABLATION , SHOCK WAVES , SHOCK TUBES , ONE DIMENSIONAL FLOW , DRAG , HEAT TRANSFER , PRESSURE , VELOCITY , TEMPERATURE , ARGON , GAS FLOW , EQUATIONS OF STATE , MATHEMATICAL ANALYSIS


Distribution Statement : APPROVED FOR PUBLIC RELEASE