Badanie procesów wymiany ciepła w wybranych elementach silników tłokowych

• Autorzy: Wiśniewski T.
• Języki publikacji: PL

Abstrakty

PL

W pracy przedstawiono wyniki badań teoretycznych i eksperymentalnych wymiany ciepła w najbardziej obciążonych termicznie elementach silnika spalinowego tłokowego, tj. zaworze wylotowym, tłoku i tulei cylindrowej. Prace teoretyczne dotyczyły zwłaszcza modelowania radiacyjnej wymiany ciepła w komorze spalania silnika o zapłonie samoczynnym, warunków wymiany ciepła między przylgnią zaworu i gniazdem, między trzonkiem zaworu a prowadnicą oraz w zespole tłok-pierścień-tuleja cylindrowa. Zaprezentowano wyniki obliczeń numerycznych radiacyjnych strumieni ciepła w komorze spalania oraz pól temperatury w zaworze wylotowym, gnieździe i tłoku. Przeprowadzono analizę wpływu warunków brzegowych na pola temperatury. Badania eksperymentalne wykonane na stanowiskach modelowych pozwoliły m.in. na określenie konduktancji kontaktowej na styku zawór/gniazdo oraz współczynnika wymiany ciepła na styku trzonek zaworu/prowadnica. Przeprowadzono również pomiary temperatury w zaworze wylotowym, prowadnicy i gnieździe oraz pomiary radiacyjnego i całkowitego strumienia ciepła na głowicy pracującego silnika 4C90.

EN

Results of theoretical analyses and experimental investigations in the most thermally loaded parts of a piston IC engine, ie. the exhaust valve, piston and liner are presented in this work. Theoretical studies were devoted mainly to modelling radiation heat transfer in the combustion chamber of a Diesel engine, the conditions of heat transfer between the valve face and seat, the valve stem and guide and between the piston, ńngs and liner. Results of numerical calculations of radiative flux distribution in combustion chamber and temperature distributions in the exhaust valve, seat and piston are shown. Numerical analysis of the influence of boundary conditions on temperature distribution in these parts was carried out. Experimental studies, performed on specially built model stands, allowed the determination of valve face/valve seat contact conductance and the heat transfer coefficient at the valve stern/valve guide interface. Results of the exhaust valve, guide and seat temperature measurements as well as radiative and total heat fluxes on valve head surface measurements, performed on the operating 4C90 engine, are also presented.

Słowa kluczowe

EN

scientific research; heat transfer processes; piston engines

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Prace Naukowe Politechniki Warszawskiej. Mechanika
• Rocznik: 2004
• Tom: z. 203
• Strony: 3--114
• Opis fizyczny: Bibliogr. 116 poz., wykr., schem., rys.

Twórcy

autor

Wiśniewski T.

• Instytut Techniki Cieplnej, Politechnika Warszawska

Bibliografia

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