Comparison on Piston Bowl Shape Effect to Diesel Spray Development

International Research and Innovation Summit 2017

Sapit, Azwan^1,2 ; Razali, Mohd Azahari^1 ; Mohammed, Akmal Nizam^1,2 ; Hushim, Mohd Faisal^1 ; Sadikin, Azmahani Binti^1 ; Ja'At, Md Norrizam Mohmad^1 ; Khalid, Amir^1

FAST Research Group, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor, Malaysia^1

Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor, Malaysia^2

关键词: Combustion characteristics;    Injection pressures;    Mass fraction distribution;    Shape geometry;    Software computing;    Spray cone angle;    Spray propagation;    Temperature increase;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/226/1/012150/pdf
DOI  :  10.1088/1757-899X/226/1/012150

来源: IOP

【 摘 要 】

Piston bowl geometry plays an important role on the combustion characteristics of diesel engine. There are various design of piston bowl in which each utilize the shape geometry to obtaining the specific required combustion characteristics. This objective of this study is to compare the effect of certain piston bowl shapes, namely Toroidal and Flat Bottom to diesel spray development. Simulation were done using ANSYS FLUENT 16.1 software Computing Fluid Dynamics (CFD). The simulation was performed on different injection pressure of 40 MPa and 100 MPa, with the ambient temperature in the combustion chamber that holding the piston is at 500K and 900K. Results showed that if the pressure and ambient temperature increases, the spray body expand outward from the spray center axis with wider spray cone angle. In addition, the geometry shape of the piston bowl influences the spray velocity distribution and the spray propagation path, indirectly effect the spray area and mass fraction distribution.