2488244 Abẹrẹ epo Diesel fun Scania DC09/DC13/DC16 Awọn ẹrọ

Cavitation ti o ni agbara inu injector Diesel iṣẹ giga kan - esiperimenta ati iwadii CFD (apakan 4)

Ni akojọpọ: 

Aworan iyara giga ti cavitation laarin orifice iṣakoso kan ṣafihan ipa hydraulic pulsing ti a ko rii ni awọn ẹkọ iṣaaju.Ti o tobi ofo cavitation ti a da pẹlú awọn orifice odi ati ni kete ti awọn conical apakan ti a ami, backfilling lodo upstream pẹlú awọn orifice.Nigbati ẹhin ẹhin ba de ẹnu-ọna orifice, iyipada ọna sisan kan wa, cavitation nla ti tunṣe ati ilana naa tun ṣe.

Awoṣe rudurudu ilọsiwaju ninu awọn iṣeṣiro CFD ṣe awọn abajade ti o jẹ deede diẹ sii ju awọn awoṣe boṣewa nigba akawe pẹlu awọn abajade esiperimenta.

Awọn CFD ibaamu awọn pulsing ti o tobi ofo cavitation pẹlú awọn orifice ati awọn pada-nkún iṣẹlẹ.

Awọn igbohunsafẹfẹ ti ihuwasi yii lori awọn abajade CFD tun gba pẹlu iyẹn ti idanwo naa.

CFD fi han pe iwọn sisan naa tun jẹ pulsating, ti o ni asopọ pẹlu ihuwasi cavitation ti a ṣalaye loke.Otitọ pe apapọ Cd ni CFD gba pẹlu iwọnwọn ninu idanwo naa fun ni igboya pe isunmi ṣiṣan CFD jẹ deede.

Lilo awọn LSM jẹ ki idagbasoke ti awọn awoṣe LES CFD ni akoko-fireemu iṣakoso kan.Eyi ṣafipamọ akoko pipọ ni idagbasoke awọn awoṣe fun awọn paati iwọn-gidi.

Ninu ọran ti injector gidi, igbohunsafẹfẹ ti cavitation pulsing ga ju lati ni ipa lori iṣẹ ẹrọ.Imọye ti iṣẹlẹ ti a pese nipasẹ iṣẹ yii yoo jẹki eyikeyi awọn ipa ipakokoro lati yago fun ni awọn ipele apẹrẹ ọjọ iwaju.

Awọn itọkasi
[1]C.Soteriou, M. Smith ati R. Andrews, "Cavitation hydraulic isipade ati atomization ni taara abẹrẹ Diesel sprays," ni IMechE C465/051/93, 1993.
[2]C.Soteriou, M. Smith ati R. Andrews, "Diesel abẹrẹ - laser ina dì itanna ti awọn idagbasoke ti cavitation ni orifices," ni IMechE C529/018/98, 1998.
[3]B.Befrui, P. Spiekermann, MA Shost ati M.-C.Lai, "VoF-LES Studies of GDi Multi-Hole Nozzle Plume Primary Breakup ati Comparision with Aworan Data," ni ILASS Europe Conference on Liquid Atomization and Spray Systems, Chania, Greece, 2013.
[4] RE Bensow, “Ifarabalẹ ti cavitation ti ko duro lori foil Delft Twist11 nipa lilo RANS, DES ati LES,” ni Apejọ Kariaye Keji lori Marine Propulsors, Hamburg, Germany, 2011.
[5]C.Egerer, S. Hickel, S. Schmidt ati N. Adams, "Onínọmbà ti rudurudu cavitating sisan ni a bulọọgi ikanni," ni SHF Conference on Hydraulic Machines ati Cavitation / Air ni Water Pipes, Grenoble, France, 2013.
[6]ML Shur, PR Spalart, MK Strelets ati AK Travin, "Ọna arabara RANS-LES pẹlu idaduro-DES ati awọn agbara LES ti o ni awoṣe," ni Iwe akọọlẹ International ti Heat ati Fluid Flow, 2008.
[7] C. Arcoumanis, JM Nouri ati RJ Andrews, "Ohun elo ti Atọka Refractive ibamu si Diesel Nozzle Internal Flow," ni 6th International Symposium lori Awọn ohun elo ti Awọn ilana Laser si Awọn ẹrọ Fluid, 1992. [8] D. Bush, CCESoteriou , M. Winterbourn ati C Daveau, "Ṣiwadii awọn ohun elo iṣakoso hydraulic ni awọn injectors ti o ga julọ" ni Awọn ọna epo fun IC Engines, IMechE 2015.