A numerical study of the unsteady processes associated with the type IV shock interactionA time-dependent ADI formulation of the two dimensional Navier-Stokes equations coupled with the total variation diminishing (TVD) scheme is used to examine the type IV shock interaction time accurately. The experimentally measured and computationally calculated unsteadiness of the type IV interaction is shown to be related to the formation and shedding of shear layers in the shock layer, and the frequency of oscillation of the jet is a strong function of the shedding rate of these shear layers. For one particular geometry, an oscillation frequency of 1.4 kHz was calculated. The effects of shock impingement angle and shock strength on the location and magnitude of the peak pressure are also identified. In one case it is shown that a 1-deg change in the impinging shock angle can alter the location of the associated jet by almost 11 deg with a change in the peak surface pressure of 32 percent.
Document ID
19930066224
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lind, Charles A. (NASA Langley Research Center Hampton, VA, United States)
Lewis, Mark J. (Maryland Univ. College Park, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1993
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 93-2479
Meeting Information
Meeting: AIAA, SAE, ASME, and ASEE, Joint Propulsion Conference and Exhibit