BIODIESEL AND WASTE COOKING OIL AS THE ALTERNATIVE FUELS: THE INJECTION PROCESS ASPECT

Sažetak U ovom radu će se raspraviti utjecaj uporabe alternativnih goriva na proces ubrizgavanja, karakteristika strujanja u mlaznicama i proces tvorbe mlaza. Rezultati analize dobiveni su na osnovi analiza uz uporabu paketa računske dinamike fluida FIRE, jednodimenzionalnog modela za izračun karakteristika ubrizgavanja i empirijskih izraza za izračun dimenzija kapljica ubrizganog goriva te dometa mlaza. Kalkulacije su izrađene za konvecionalan sustav ubrizgavanja s linijskom pumpom, visokotlačnim cijevima i mlaznicom sa četiri rupe. Dobiveni rezultati mogu se koristiti za ispravno podešavanje sustava za ubrizgavanje na primjeru uporabe alternativnog goriva umjesto klasičnog dizelskog goriva.Abstract The presented paper discusses the influence of using alternative fuels on the fuel injection process, in-nozzle flow characteristics and spray formation process. The analysis is performed using the computational fluid dynamics package Fire, a one-dimensional mathematical model for the injection process characteristics calculations and empirical models for calculating the injected droplet mean diameter and spray penetration length. The calculations were performed for the conventional fuel injection system with the in-line pump, high pressure tube and four-hole nozzle with the sac chamber. The results of presented analysis can be used to set properly the fuel injection system for operation with alternative fuels