The Study Of Small-scale Power Systems Based On Rotary Engine And Microbial Fuel Cell

The widely use of MEMS prompted the extensive research of Power MEMS. Micro(small) rotary engine-generator device and Micro(small) microbial fuel cell are two difference research programs of Power MEMS.Micro(small) rotary engine-generator device supplied with liquid hydrocarbon has merits of high power density and its output is steady and controllable.In micro(small) microbial fuel cell,microbial such as saccharomyces cerevisiae catabolize glucose and generate electricity,it has merits of cheap material,no pollution,nonexplosive,long life-span for use etc.The thesis includes two main parts:The first part includes from chapter two to chapter four.In this part,analyzed the thermodynamic condition of ignition and flameout and the influence of quenching distance in micro-combustion,studied the micro-combustion theory and the configuration and work principle of rotary engine.A modified contour of rotary engine was made based on simulation of thermal stress and testing experience.On these bases,a centimeter-size rotary engine R.Ⅱand a millimeter-size rotary engine R.Ⅲwere designed,manufactured and tested.R.Ⅱrotary engine was the small-scale rotary engine which can steady operate for the longest time in China.The internal key size of R.Ⅱdoes not exceed 4 cm,and total size does not exceed 10 cm,the maximal output of R.II was 220W,and its steady output was 150W,can operated more than one hour every test.R.III was the smallest rotary engine in China,its output was 2.5W,the internal key size of R.Ⅲdoes not exceed 8mm.The first part includes from chapter five to chapter seven.In this part,studied and analyzed the electrogenesis principle and influence factors of Microbial Fuel Cell(MFC). Two small-scale MFC devices,M.Ⅱand M.Ⅲ,were made.They use iron electrode as positive electrode,the bacteria spawn of them was the Saccharomyces cerevisiae after fourth electron domestication.The cubage of M.II was 8ml,its output was 0.38mW,its internal resistance was 320Ω,its open voltage was 0.725V,M.Ⅱcan steadily working more than 250min.The cubage of M.III was 3.2ml,its output was 0.33mW,its internal resistance was 325Ω,its open voltage was 0.682V,M.II can steadily working more than 120min.In these bases,a new MFC device was found:iron positive electrode and no-PEM MFC device.Relative to conventional MFC,the new one had merits of higher power output, lower internal resistance and cheaper,but its steadily working time was short.