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Fuel Injection by a Thermal Microinjector


 This paper reports a new application of a thermal microinjector for fuel injection. The paper estimates the ejected velocity of the diesel fuel droplet, and the minimum temperature for bubble formation. The fuel spray penetration is calculated by solving nonlinear equations of motion. Analysis of the temperature profile evolution and activation curve between water and diesel fuel is helpful for optimization of the microinjector design. The microinjector is fabricated using combined surface and bulk micromaching. The preliminary testing of the microinjector with fuel demonstrates the possibility of droplet ejection. Also, discussion about design issues reveals some advantages of the microinjector over the conventional fuel injector.