Karafan Journal

Karafan Journal

The Effect of Multi-size Valve on Improvement of Swirl Flow for Gas-based EF7 Engine

Document Type : Original Article

Authors
Sayad Nasiri 1
Hossein Rahimi Asiabaraki 2
Ehsan Razaghi 3
1 Faculty Member, Center for Engineering Skills, Sharif University of Technology, Tehran, Iran.
2 Faculty Member, Department of Mechanical Engineering, Faculty of Shahid Beheshti, Alborz Branch,Technical and Vocational University (TVU), Alborz, Iran.
3 B. Sc. , Department of Mechanical Engineering, Sapco Center of Applied Science and Technology, University of Applied Science and Technology, Tehran, Iran.
10.48301/kssa.2021.128399
Abstract
One of the methods to increase the combustion efficiency in an internal combustion engine is to create swirl flow. In EF7 engine, there are two inlet valves per cylinder so small amount of swirl flow may be created. Most of the conventional methods for generating vortex current, even used in new engines, require major design and modifications of cylinder head, and their costs are significant. In this study, a new low-cost method was developed to create vortex flow. The goal of the changes is to develop inlet flow difference between the two inlet valves led to develop swirl flow in the cylinder in order to increase the combustion efficiency provided that the flow coefficient doesn’t face a loss. First, the swirl flow in an EF7 engine was measured at steady state and then the intended changes was implemented on the two ends of the cylinder head. After that, all valves sits' angle were fabricated in accordance with corresponding standards. Then, this method was experimentally evaluated using the flow bench test so that in addition to measure the accuracy of swirl flow, the swirl flow coefficient can be compared with other methods such as flow control valve. The results show that there is a minor reduction in flow coefficient for low valve lifts, but It can be gained an acceptable amount of swirl flow for high valve lifts with minor costs and changes for cylinder head in comparison with other designs.
Keywords
Swirl flow
Combustion efficiency
Multi-size valve
Inlet port
Flow coefficient
Subjects
References
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Karafan Journal
Volume 17, Issue 4 - Serial Number 50
Technical and Engineering
Winter 2021
Pages 119-134

  • Receive Date 19 December 2020
  • Revise Date 17 January 2021
  • Accept Date 19 January 2021