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Unsteady ejector performance: an experimental investigation using a pulsejet driver
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dougherty, Kevin T. Paxson, Daniel E. Wilson, Jack |
| Copyright Year | 2002 |
| Description | An experimental investigation is described in which thrust augmentation and mass entrainment were measured for a variety of simple cylindrical ejectors driven by a gasoline-fueled pulsejet. The ejectors were of varying length, diameter, and inlet radius. Measurements were also taken to determine the effect on performance of the distance between pulsejet exit and ejector inlet. Limited tests were also conducted to determine the effect of driver cross-sectional shape. Optimal values were found for all three ejector parameters with respect to thrust augmentation. This was not the case with mass entrainment, which increased monotonically with ejector diameter. Thus, it was found that thrust augmentation is not necessarily directly related to mass entrainment, as is often supposed for ejectors. Peak thrust augmentation values of 1.8 were obtained. Peak mass entrainment values of 30 times the driver mass flow were also observed. Details of the experimental setup and results are presented. Preliminary analysis of the results indicates that the enhanced performance obtained with an unsteady jet (primary source) over comparably sized ejectors driven with steady jets is due primarily to the structure of the starting vortex-type flow associated with the former. |
| File Size | 1103660 |
| Page Count | 20 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20030002821 |
| Archival Resource Key | ark:/13960/t1fj7dp9j |
| Language | English |
| Publisher Date | 2002-06-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Propulsion System Performance Mass Flow Rate Vortices Gasoline Ejectors Cylindrical Bodies Entrainment Thrust Augmentation Pulsejet Engines Unsteady Flow Intake Systems Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
