Abstract
Our aim concerns the development of a new technology for the exhaust-gas-flow measurement from internal combustion engines, using an infrared thermograph (hereafter, referred to as ITG) by detecting heat-radiation energy in proper wavelength ranges of various components included in the automobile exhaust gas. At first, we reveal the actual flow field around an exhaust-pipe exit of a gasoline engine using an infrared thermograph, together with a hot-wire velocimetry compensated the thermal, gas-composition and flow-direction effects upon the flow velocity, using a cold-wire technique (hereafter, referred to as HWV) and a particle image velocimetry (hereafter, referred to as PIV). Next, we research various factors, like background-temperature effect and gas-component effects, to affect the ITG measurements. This ITG-measurement technology has an advantage that we can get real-time spatial information about temperature and gas-component concentrations without any test-field disturbances by sensor probes inserted in the test flow field. In the present study, we research the gas-component factors such as CO, CO2, and H2O which influence the infraredthermograph output, methodically.
Keywords: Exhaust gas, Infrared thermograph, Visualisation, Measurement, Temperature