ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-483-0
ISBN Online: 978-1-56700-482-3
4th Thermal and Fluids Engineering Conference
MOUNT INTERFERENCE EFFECTS ON TOTAL TEMPERATURE PROBES
Total temperature probes have a large range of uses in high temperature applications and are known to be characterized by errors due to conduction, convection, and radiation heat transfer into the probe. Additionally, a fourth source of error caused by the conversion of kinetic energy to thermal energy throughout the sensor's boundary layer is known as velocity error. Each of these errors have been characterized during past years; however, the behavior of each error source changes greatly with the presence of a mounting strut. A Kiel/shield is commonly used to reduce the local flow Mach number around a total temperature probe. This Mach reduction results in a significant decrease in velocity error. A mounting strut alters the flow-field around the probe in a way that similarly reduces the local flow Mach number. Therefore, a mounting strut can be utilized to provide benefits similar to a shielded sensor such as a reduction in velocity error. This paper presents a simple low-order model that utilizes potential flow to model velocity error for a strut mounted total temperature probe. This model accounts for Mach number effects through the use of a Karman-Tsien compressibility correction and can be easily utilized for total temperature probe design and optimization. An experimental investigation is employed to analyze the effects of mount interference and validate the developed analytical model. The experimental investigation was conducted using strut mounted thermocouples in a high-speed jet at Mach numbers ranging from 0.25-0.72.