Abstract
The Local-contact Microwave-heating Injector (LMI) was designed with the coaxial cable. The coaxial cable can make the lines with less restriction of the line layout to transfer the microwave. The coaxial cable also realizes the high spatial microwave density at the end of the coaxial cable, where the microwave irradiates. The microwave generator was controlled with the inverter and the source was AC100V, 60Hz. The fuel temperature near the injection hole was measured with the sheath K-type thermocouple. The fuel was ethanol. The images of the sprays were caught with 130Mpix CCD camera, 1200fps high speed camera. A laser diffraction method was used to evaluate the distributions of the droplet diameter. As the result, the droplet diameter that showed the maximum volume ratio was decreased when the fuel was heated with the microwave.
