High-Accuracy Turbine Performance Measurements in Short-Duration Facilities

Abstract

This paper describes work done in preparation for the measurement of stage efficiency in a short-duration shock-tunnel facility. Efficiency measurements in this facility require knowledge of the flow with path pressure and temperature, rotating system moment of inertia, and mass flow. This paper describes in detail and improved temperature compensation technique for the pressure transducers (Kulite) to reduce thermal drift problems, and measurements of the rotating system moment of inertia. The temperature compensation has shown that the conversion to pressure is accurate to within 0.689 kPa (0.1 psi) over the 40°C test range. The measurement of the moment of inertia is shown to be accurate to within 0.7 percent of the average value.

Accurate Turbine Inertia Measurement

“…The second approach is based on an idea proposed by Haldeman and Dunn [10]. The method consists of performing both an acceleration and deceleration during the same test using a known torque.…”

High-Accuracy Turbine Performance Measurements in Short-Duration Facilities

“…Blowdown facilities generally employ some type of brake, which makes measurement of the torque critical. Since the goal of a good performance experiment would be to measure the efficiency using both techniques, an attempt has been made to improve the accuracy of the pressure, moment of inertia, and total temperature measurements in preparation for efficiency experiments This paper reviews the results achieved on the pressure and moment of inertia measurements, and is an abbreviated version of a more detailed report, Haldeman and Dunn (1995). Earlier thermocouple data were reported in Dunn, et al (1990).…”

A concept study for a piston driven sCO2 turbine test facility

“…In 1991, Halderman et al [9] demonstrated measurements of 0.25% precision within a 95% confidence limit within a transient facility. Whilst other scholars have argued the legitimacy of these results, it is important to note that different facilities require different improvements and data acquisition software to obtain these results.…”

“…Whilst other scholars have argued the legitimacy of these results, it is important to note that different facilities require different improvements and data acquisition software to obtain these results. Nonetheless, over the last 30 years, shortduration facilities have become the clear choice for characterisation of flows to with a high degree of accuracy [9].…”