Author : Matthew R. Maurer
Publisher :
Page : 100 pages
File Size : 28,22 MB
Release : 2014
Category : Rocket engines
ISBN :
In this work we present mathematical models for a rocket nozzle exhaust plume expanding into a vacuum; specifically, models for plume density introduced by Simons and Cai. The models are discussed and compared to simulation results produced with the direct simulation Monte Carlo method. Simons' model, which is based in Prandtl-Meyer flow and boundary layer theory is discussed first. The model has several questionable assumptions and conclusions, which are analyzed. Cai's model, based on molecular gas dynamics, is described and offered as an alternative to Simons'. Numerical gas dynamic simulations utilizing the direct simulation Monte Carlo method were performed to validate Cai's model. These simulations are introduced and discussed. A description of the simulation's method and implementation is included. Literature review of articles related to simulating exhaust plumes is also discussed. Some results from those articles are compared to the aforementioned simulation results to further validate the model.