Accession Number : AD0802224

Title :   ANALYSIS OF PULSATING FLOWS IN INFINITE AND FINITE CONICAL NOZZLES.

Descriptive Note : Technical rept. Mar 65-Oct 66,

Corporate Author : MECHANICAL TECHNOLOGY INC LATHAM NY

Personal Author(s) : Chiang, T. ; Hsing, F. C. ; Pan, C. H. T. ; Elrod, H. G., Jr

Report Date : OCT 1966

Pagination or Media Count : 49

Abstract : The pulsating flows in both infinite and finite conical nozzles were analyzed theoretically. Sinusoidal pressure disturbances were impressed at the nozzle exit for the infinite nozzle and at either the inlet or at the exit for the case of a finite nozzle. The results have been calculated in terms of mass flux response. The parameters involved are the Mach number and the modified Strouhal number; the inlet and exit radii ratio enters as an additional parameter for a finite nozzle. The results for an infinite conical nozzle indicate that, when the frequency is low, the quasi-static relationship between the pressure and mass flux fluctuations holds. But, as the frequency increases, the dynamic characteristics of the pulsating flow become important. And, at high frequencies, the mass flux response is less than the quasi-static value by an amount depending on the Mach number. The analysis for finite nozzles has been carried out to a stage ready for programming on a computer, and numerical computation can be performed in a straightforward manner.

Descriptors :   *CONICAL NOZZLES), (*GAS FLOW, FLUID DYNAMICS, SUBSONIC FLOW, SUBSONIC NOZZLES, NOZZLE THROATS, ENTHALPY, STABILITY, OSCILLATION, FREQUENCY, HYDRODYNAMICS, ORIFICES, NUMERICAL ANALYSIS, PARTIAL DIFFERENTIAL EQUATIONS, PRESSURE, TABLES(DATA).

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE