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Experimental investigations of hydrogen effects on performance and emissions of renewable diesel fueled RCCI / Vandenilio įtaka energiniams ir emisijos rodikliams alternatyviu dyzelinu veikiančiame RCCI variklyje – eksperimentinis tyrimas

Abstract

The article presents the study of hydrogen effects on performance, combustion and emissions characteristics of renewable diesel fueled single cylinder CI engine with common rail injection system in RCCI mode. The renewable diesel fuels as the HRF are the HVO and it blend with petrol diesel further named PRO Diesel, investigated in this study. The purpose of this investigation was to examine the influence of the LRF – hydrogen addition to the HRF on combustion phases, engine performance, efficiency, and exhaust emissions. HES was changed within the range from 0 to 35%. Hydrogen injected through PFI during intake stroke to the combustion chamber, where it created homogeneous mixture with air. The HRF was directly injected into combustion chamber using electronic controlled unit. Tests were performed at both fixed and optimal injection timings at low, medium and nominal engine load. After analysis of the engine bench results, it was observed that lean hydrogen – HRF mixture does not support the flame propagation and efficient combustion. While at the rich fuel mixture and with increasing hydrogen fraction, the combustion intensity concentrate at the beginning of the combustion process and shortened the ignition delay phase. Decrease of CO, CO2 and smoke opacity was observed with increase of hydrogen amounts to the engine. However, increase of the NO concentration in the engine exhaust gases was observed.


Santrauka


Straipsnyje pateiktas tyrimas apie vandenilio įtaką vieno cilindro slėginio uždegimo variklio energiniams parametrams ir deginių sudėčiai, kuriame alternatyvūs dyzeliniai degalai įpurškiami akumuliatorine įpurškimo sistema „Common rail“, varikliui veikiant RCCI režimu. Šiame tyrime buvo naudojami aukšto cetaninio skaičiaus alternatyvus dyzelinis degalas HVO ir jo mišinys su dyzelinu, toliau vadinamu PRO Diesel. Šio tyrimo tikslas – išbandyti žemo cetaninio skaičiaus degalo – vandenilio – įtaką aukšto cetaninio skaičiaus alternatyvaus dyzelinio degalo HVO degimo fazėms, variklio veikimo efektyvumui ir deginių kiekiui. Vandenilio energtinė dalis mišinyje buvo keičiama nuo 0 iki 35 %. Vandenilis buvo tiekiamas įsiurbimo fazės metu, įsiurbimo kanalu į degimo kamerą, kurioje jis, susimaišęs su oru, sudaro homogeninį mišinį. Aukšto cetaninio skaičiaus degalas HVO buvo tiesiogiai įpurškiamas į degimo kamerą, įpurškimo momentą ir trukmę valdant elektroniniu būdu. Bandymai buvo atliekami nekeičiant įpurškimo kampo ir nustačius optimalų įpurškimo kampą, esant žemai, vidutinei ir nominaliajai variklio apkrovai. Išnagrinėjus bandymo rezultatus buvo pastebėta, kad, degant liesam vandenilio-HVO mišiniui, liepsna plinta lėtai ir mišinys dega neveiksmingai. Esant riebiam degalų mišiniui ir didinant vandenilio energijos dalį, degimo intensyvumas koncentruojasi degimo proceso pradžioje ir sutrumpėja uždegimo gaišties trukmė. Buvo pastebėta, kad CO, CO2 ir kietųjų dalelių sumažėjo didinant vandenilio kiekį, tačiau padidėjo NO koncentracija variklio išmetamosiose dujose.


Reikšminiai žodžiai: vandenilis, RCCI, HVO, NExBTL, PRO Diesel, MFB, degimo procesas, deginių emisija, detonacija.

Keyword : hydrogen, RCCI, HVO, NExBTL, PRO Diesel, MFB, combustion, emission, abnormal combustion

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