Design of injector nozzle for DME common-rail injection system using nozzle flow model

Name: Han, Sangwook

Organization : Korea Automotive Technology Institute

Name: Sin, Yunsub

Organization : Korea Automotive Technology Institute

Name: Kim, Hyunchul

Organization : Korea Automotive Technology Institute

Name: Lee, Geesoo

Organization : Youngsan University

Email : gslee@ysu.ac.kr

keyword: DME common-rail

ThaSH: Methyl ether

; Discharge coefficient

; Flow model

Abstract: The nozzle flow model was used to design the injector nozzle and to obtain the initial spray conditions for di-methyl Ether(DME) common-rail injection system. In order to deliver the same amount of energy to that provided by diesel at low injection pressure of 40 MPa, the injector for DME needs larger diameters of nozzle holes and SAC volume under the same injection duration. In addition, the needle lift and the needle seat diameter should be increased to keep the minimum flow area ratio. Although the vapour pressure of DME is lower than that of diesel, the timing of cavitation inception for DME was delayed due to the decreased injection. pressure and thus low flow loss. DME showed higher discharge coefficients and effective nozzle exit diameters owing to low injection pressure and enlarged nozzle hole diameters.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2018

Modified: 2025-06-17

Issued: 2025-06-17

บทความ/Article

application/pdf

BibliograpyCitation : In Thammasat University Faculty of Engineering. The 9th TSME International Conference on Mechanical Engineering 2018 (TSME-ICoME9) (pp.203-208) Pathum Thani : Thammasat University

eng

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