Internal Pressure Measurements for a Liquid Payload at Low Reynolds Numbers
Abstract
Spin-stabilized projectiles can experience poor flights due to the influence of liquid payloads. Substantial analytical and numerical work has been done on this problem, but quality experimental data on the primitive variables of the liquid (pressure and velocity) are still required to evaluate the accuracy and applicability of models and codes. In free gyroscope tests for Reynolds numbers less than 100, the broadening effect of low Reynolds numbers is also evident. Evidence of related liquid instabilities for actual flight data was reported. A full-scale three-degree-of-freedom flight simulator was used to examine both endwall and sidewall pressure fluctuations, as well as the phase relationship between the maximum pressure and cylinder orientation for a high Reynolds number of 18,200. Scale simulations of high viscosity liquid payloads were completed for a Reynolds number range of 3.1 - 8.9. Testing included establishing instrumentation reliability, repeating previously published low Reynolds number data, expanding the range in nondimensional coning frequency and Reynolds number, and providing a data base for comparisons with current linear theory applications at low Reynolds number. Based on these preliminary results, extensive testing can be accomplished on the BRL Flight Simulator using a full- scale cylinder and larger instrumentation payload capacity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1988
- Accession Number
- ADA197438
Entities
People
- Bradford S. Davis
- David J. Hepner
- Keith P. Soencksen
- Nicholas G. Maiorana
Organizations
- Ballistic Research Laboratory