Accession Number:

ADA801453

Title:

Efficiency of a Radial-Flow Exhaust-Gas Turbosupercharger Turbine with a 12.75-Inch Tip Diameter

Descriptive Note:

Wartime rept.

Corporate Author:

AIRCRAFT ENGINE RESEARCH LAB CLEVELAND OH

Personal Author(s):

• Coulter, Earl E.
• Larkin, Robert G.
• Gabriel, David S.

Report Date:

1946-07-01

Pagination or Media Count:

30.0

Abstract:

An investigation has been made of the effect on the performance of a radial-flow exhaust-gas turbosupercharger turbine with a 12.75-inch tip diameter of various inlet pressures, inlet temperatures, wheel speeds, pressure ratios, and cooling-air flows. For a given blade-to-jet speed ratio, variation in pressure ratio from 1.5 to 4.0 and inlet temperature from 600 to 1200 deg R had only a small effect on turbine efficiency. For blade-to-jet speed ratios of 0.5 and 0.6, the efficiency increased 4.5 points as inlet pressure increased from 20 to 50 inches of mercury absolute. Cooling-air flow had no measurable effect on turbine efficiency within the accuracy of the tests in the test range namely, ratios of cooling-air flow to turbine gas flow from 0 to 14 percent, turbine pressure ratio of 2.0, turbine Inlet total pressures from 15 to 40 Inches of mercury absolute, and inlet temperatures from 600 to 2000 deg R.

Descriptors:

• *TURBOSUPERCHARGERS
• EFFICIENCY
• GAS FLOW
• INLETS
• MEASUREMENT
• PRESSURE
• TEMPERATURE
• TURBINES
• VELOCITY

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE