COMPARISON OF COMBUSTION INDICATORS OF TWO-STROKE ENGINES WITH A CARBURETOR AND DIRECT FUEL INJECTION

The subject matter of study in the article is indicators combustion process a two-stroke engine 1D 8.7 / 8.2 with spark ignition when using carburetor power supply system (external mixture formation) and direct fuel injection (internal formation). Internal formation ensures organization stratified fuel-air charge (SFAC) lean (SLFAC). Combustion allow you to assess nature process. goal determine change external internal during working SFAC SLFAC at load characteristic modes (n = 3,000 rpm). tasks be solved are as follows. use made it possible obtain values ηi greater than all characteristic. maximum value for 0.5 bmep 0.2 MPa, – 0.44 0.25 MPa 0.3 0.36 an carburettor. Maximum pressure (рz), increase ratio (λ), preliminary expansion (ρ), further (δ), character indicator (m), heat release rate (dx dfi max), duration from TDC point Z (φz), total (dφz); construct characteristics changes empirical dependences depending on load. An experimental-analytical research method used, which provides determination analysis course according established by experimental diagrams. following results were obtained. ре - carburetor. cylinder piston position average 1.5 times higher carburetor, рz up 11 % (the degree λ reduced 26 %) 20-22 31 %). compression ε 26.4 decrease ρ comparison δ 30 43 system. When organizing SLFAC, m is, average, 1.4 that 1.45 relative SFAC, dx max 40 allowed reduce 39 36 organization. Conclusions. scientific novelty obtained consists obtaining data It was found best technical, economic environmental correspond mixing SLFAC.