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Abstrakty
The article presents the research results of load influence on errors of the piston Top Dead Centre (TDC) position determined on indication graph with combustion. For TDC determination the method proposed by Polanowski is applied. This method is based on least-squares approximation with model of thermodynamic compression using apolynomial exponent. So, designated TDC are kinematics. This method make possible determination the TDC on the indicator diagram with combustion, as well as the total compression ratio and the dynamic error of pressure (offset). Research were done on the laboratory engine Sulzer 3AL25/30 for load range of 50-250 kW and rotational speed 750 rpm, which corresponds to 15-90% nominal load. Cylinder pressures were recorded with a resolution ofn O.5 OWK by means of multichannel recorder UNITEST 205. For pressure measurements were applied strain gauge pressure sensors Spais Company. For the analysis of indicator diagrams used its own specially developed algorithm and program for the automatic determination of TDC, based on the model of the compression process with the exponent of the polynomial. Simultaneously three parameters were determined: the position of TDC, the total compression ratio and offset the pressure. Additionally set the position of the zeros of the second order derivatives, which are sometimes considered as reference points to TDC of pistons. For smoothing of indicator diagrams their own algorithms and programs of moving approximation by polynomials of 3rd degree was used. The results of research have shown the essential load influence on the errors of TDC positions on indicator diagrams.
Słowa kluczowe
Wydawca
Czasopismo
Rocznik
Tom
Strony
361--368
Opis fizyczny
Bibliogr. 6 poz., rys.
Twórcy
autor
autor
- Gdynia Maritime University, Faculty of Marine Engineering Morska Street 83, 81-225 Gdynia, Poland, pawletko@am.gdynia.pl
Bibliografia
- [1] Gałecki, W., Tomczak, L., Metoda określania położenia wału korbowego silnika okrętowego na podstawie analizy krzywej sprężania. Journal of KONES Internal Combustion Engines, Bielsko Biała 1997.
- [2] Łutowicz, M., Ocena szczelności komory spalania okrętowego tłokowego silnika spalinowego w czasie eksploatacji. Diagnostyka 2(48), 2008.
- [3] Polanowski, S., Determination of location of Top Dead Centre and compression ratio value on the basis of ship engine indicator diagram. Polish Maritime Research, No. 2(56), Vol. 15, 2008.
- [4] Polanowski S.: Studium metod analizy wykresów indykatorowych w aspekcie diagnostyki silników okrętowych. Zeszysty Naukowe Nr 169 A, Akademia Marynarki Wojennej, Gdynia 2007.
- [5] Staś, M. J., Thermodynamic Determination od T.D.C. In Piston Combustion Engines. SAE Paper, No. 960610.
- [6] Tazerout, M., Le Corre, O., Rousseau, S., TDC Determination in IC Engines Based on the Thermodynamic. SAE Paper, No. 1999-01-1489.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ7-0017-0018