Application of a Miniature Telemetry System in a Small Gas Turbine Engine

Abstract

For the purpose of assessing combustion effects in a small gas turbine engine, there was a requirement to evaluate the rotating temperature and dynamic characteristics of the power turbine rotor module. This assessment required measurements be taken within the engine, during operation up to maximum power, using rotor mounted thermocouples and strain gages. The acquisition of this data necessitated the use of a telemetry system that could be integrated into the existing engine architecture without affecting performance. Due to space constraints, housing of the telemetry module was limited to placement in a hot section. In order to tolerate the high temperature environment, a cooling system was developed as part of the integration effort to maintain telemetry module temperatures within the limit allowed by the electronics. Finite element thermal analysis was used to guide the design of the cooling system. This was to ensure that sufficient airflow was introduced and appropriately distributed to cool the telemetry cavity, and hence electronics, without affecting the performance of the engine. Presented herein is a discussion of the telemetry system, instrumentation design philosophy, cooling system design and verification, and sample of the results acquired through successful execution of the full engine test program.

Wireless Power Transfer System for Rotary Parts Telemetry of Gas Turbine Engine

“…To evaluate the combustion effect of small gas turbine engines, the article by Long et al [3] developed a telemetry system that can be integrated into an existing engine without affecting its performance. At the same time, in order to prevent the telemetry system from being damaged when the aircraft engine works in high-altitude environments, a cooling system was also designed to ensure the normal operation of the telemetry module.…”