THE PERFORMANCE OF HIGH POWER OUTPUT AXIAL FLOW TURBINES UTILIZING FLOWS IN THE TRANSONIC REGIME
Abstract
The equations for estimating the performance of an axial flow turbine are examined to determine the efficiency and other parameters when very high power outputs per stage are required. It is indicated that turbine stages should be designed for peak efficiency or for high power output, but that compromise designs are not advisable. A survey of the immediately available literature on losses in turbine stages at the U. S. Naval Postgraduate School is outlined. An attempt to find and correlate specific loss data with theoretical relations was not successful. Data is fragmentary, theoretical relations are few, and the correlation of the available data on profile losses, tip clearance losses, effect of trailing edge thickness and secondary losses is poor. An axial flow single stage turbine was designed for transonic flows and a digital computer program was written to evaluate the off-design performance of this turbine. The particular relations for supersonic expansion after a blade row are included in the program as well as the effects of entry shocks into the rotor. Initial indications are that the program should be useful for evaluating turbines designed by the procedure shown. The computer programs included are written in FORTRAN language for the CDC 1604 Digital Computer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1963
- Accession Number
- AD0481358
Entities
People
- Robert E. Howard Jr.
Organizations
- Naval Postgraduate School