Analyzing the Impact of Droplet Impingement Interval on Biodiesel Deposition Characteristics

Abstract

The purpose of this work is to investigate the effect of droplet impingement interval on deposition characteristics of diesel fuel (DF) and palm oil biodiesel with different blending ratios (B10-B50) by applying the hot surface deposition test (HSDT). Generally, HSDT method is a simplified method to simulate fuel deposition in diesel engines by impinging fuel droplets on a heated aluminum alloy plate surface. The mass of accumulated deposits after droplets N_D=16000 for impingement interval of t_imp=7 seconds (dry condition) M_R=3.7mg (DF), M_R=3.9mg (B10), M_R=17.1mg (B20), M_R=24.0mg (B30), M_R=25.1mg (B40), and M_R=28.8mg (B50). For impingement interval of t_imp=3 seconds (wet condition), the deposit mass was M_R=4.4mg (DF), M_R=8.9mg (B10), M_R=20.4mg (B20), M_R=31.1mg (B30), M_R=62.4mg (B40), and M_R=58.2mg (B50). In terms of deposit surface temperature, the recorded average minimum and maximum deposit surface temperatures were between T_d=295°C to T_d=325°C (t_imp=7 seconds) and T_d=200°C to T_d=300°C (t_imp=3 seconds) for DF. For B10-B50, the deposit surface temperatures were around T_d=290°C to T_d=350°C (t_imp=7 seconds) and below T_d=200°C for impingement interval of t_imp=3 seconds.