Numerical CFD Analysis of a Direct Injection (DI) Four Strokes Single Cylinder Diesel Engine at Different Compression Ratios

Nhad  K Frhan; Azwan  Sapit; Mohd Azahari  Razali; Mohd Faisal  Hushim; Akmal Nizam  Mohammed; Bukhari  Manshoor; Amir  Khalid

Authors

Nhad K Frhan FAST Research Group, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor, Malaysia
Azwan Sapit Faculty of Mechanical & Manufacturing Engineering, UniversitiTun Hussein Onn Malaysia. Parit Raja, Johor, Malaysia
Mohd Azahari Razali Faculty of Mechanical & Manufacturing Engineering, UniversitiTun Hussein Onn Malaysia. Parit Raja, Johor, Malaysia
Mohd Faisal Hushim Faculty of Mechanical & Manufacturing Engineering, UniversitiTun Hussein Onn Malaysia. Parit Raja, Johor, Malaysia
Akmal Nizam Mohammed FAST Research Group, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor, Malaysia
Bukhari Manshoor FAST Research Group, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor, Malaysia
Amir Khalid Faculty of Mechanical & Manufacturing Engineering, UniversitiTun Hussein Onn Malaysia. Parit Raja, Johor, Malaysia

Keywords:

direct injection diesel engine, combustion, in-cylinder pressure, in-cylinder temperature, compression ratio, CFD modeling

Abstract

This study investigated the non-premixed combustion procedure by using ANSYS 18 software, with varied compression ratios as one of the effective engine design parameters and the theoretical cylinder pressure values were validated with the obtained result. Diesel and n-Heptane fuels were utilized to investigate their effects on combustion process. There are several combustion parameters such as, in-cylinder temperature, in-cylinder pressure, Heat Release rate (HRR), swirl ratio and tumble motion and all these parameters were compared for both the fuels. This work considered the compression ratios of 13, 15 and 17 to find out optimum value at which the combustion process was the best and attained stability. The obtained result reveals that with increasing compression ratio, the pressure and temperature within the cylinder were boosted up along with the increase in swirl ratio and heat release rate.