Ultrasonic-based gas flowmeter for harsh environmental conditions

摘要

The applicability of an ultrasonic transit-time gas flowmeter can be extended regarding its gas temperature range (up to 450℃). We used computational fluid dynamics and ray-tracing techniques to investigate thermally-related effects that influence the sound propagation inside the flowmeter. This allowed us to optimize the geometry and the method of how to operate the flowmeter. Our results prove that such a flowmeter can be used to measure pulsating gas flows over wide temperature and velocity ranges such as found in the exhaust gas train of an automotive combustion engine.