NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Comparison Between Numerically Simulated and Experimentally Measured Flowfield Quantities Behind a PulsejetPulsed combustion is receiving renewed interest as a potential route to higher performance in air breathing propulsion systems. Pulsejets offer a simple experimental device with which to study unsteady combustion phenomena and validate simulations. Previous computational fluid dynamic (CFD) simulation work focused primarily on the pulsejet combustion and exhaust processes. This paper describes a new inlet sub-model which simulates the fluidic and mechanical operation of a valved pulsejet head. The governing equations for this sub-model are described. Sub-model validation is provided through comparisons of simulated and experimentally measured reed valve motion, and time averaged inlet mass flow rate. The updated pulsejet simulation, with the inlet sub-model implemented, is validated through comparison with experimentally measured combustion chamber pressure, inlet mass flow rate, operational frequency, and thrust. Additionally, the simulated pulsejet exhaust flowfield, which is dominated by a starting vortex ring, is compared with particle imaging velocimetry (PIV) measurements on the bases of velocity, vorticity, and vortex location. The results show good agreement between simulated and experimental data. The inlet sub-model is shown to be critical for the successful modeling of pulsejet operation. This sub-model correctly predicts both the inlet mass flow rate and its phase relationship with the combustion chamber pressure. As a result, the predicted pulsejet thrust agrees very well with experimental data.
Document ID
20080045534
Document Type
Technical Memorandum (TM)
Authors
Geng, Tao (North Carolina State Univ. Raleigh, NC, United States)
Paxson, Daniel E. (NASA Glenn Research Center Cleveland, OH, United States)
Zheng, Fei (North Carolina State Univ. Raleigh, NC, United States)
Kuznetsov, Andrey V. (North Carolina State Univ. Raleigh, NC, United States)
Roberts, William L. (North Carolina State Univ. Raleigh, NC, United States)
Date Acquired
August 24, 2013
Publication Date
October 1, 2008
Subject Category
Aircraft Propulsion and Power
Report/Patent Number
NASA/TM-2008-215432
E-16597
AIAA-2008-5046
Meeting Information
44th Joint Propulsion Conference and Exhibit(Hartford, CT)
Funding Number(s)
WBS: WBS 561581.02.08.03.17.02
Distribution Limits
Public
Copyright
Public Use Permitted.

Available Downloads

NameType 20080045534.pdf STI