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Dołączył: 29 Paź 2010
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 Wysłany: Sob 21:41, 27 Lis 2010 Temat postu: GHD glätteisen günstig Marine switching pr |
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Marine transition process have been turbocharged diesel engine simulation 1TC/2TC
Switching delay time is zero), the controlled speed of the turbocharger is also the case of a small open air valve, the controlled air flow turbocharger will appear \state in the surge; if switching delay time is very large (such as switching time is infinite),[link widoczny dla zalogowanych], in a controlled turbocharger gas valve opens the air valve does not always open (not controlled turbocharger to work), then enter the base by Gas flow pressure device speed continued to drop and leaving half surge occurs, the amount of air into the cylinder shortage, severe cases can lead to decline until the engine speed hold back stop. Therefore, have a particular engine, there is a relatively suitable or \Figure 2 (a) can be seen, when the controlled valve is opened gas turbocharger, the decline in basic speed of the turbocharger, increase the speed of the controlled turbocharger, turbocharger speed when controlled slightly more than the basic turbocharger,[link widoczny dla zalogowanych], and then open the air valve controlled turbocharger is more appropriate. Different type of engine, the switch delay time relative to the right is different. On 16PA6STC engine,[link widoczny dla zalogowanych], the turbocharger in a controlled gas valve to open 2.6S about the speed of the controlled turbocharger turbocharger very basic and fundamental. In order to quantitatively compare open the gas valve opens the air valve of the time delay on the switching process of diesel engines, but also calculate the gas valve opens the air valve delay l, 2.4,3.7, and 5s open controlled turbocharger compressor machine running track. The results show that: when the switching delay of ls, the controlled turbocharger compressor surge is running in the area; when switching delay of 2.4 and 3.7S, the basic supercharger and turbocharger are basically at a controlled In normal operation, surge phenomenon does not occur; when switching delay time is 5s, the basic operation of the turbocharger compressor surge began to enter the track area, the engine speed has dropped significantly. Therefore, in terms of 16PA6STC diesel engine, lTC a 2TC switching delay time as 2.4 ~ 3.7S is feasible. Discussions with the preceding analysis and simulation results, select the 2.7S switch delay time is more appropriate. 3 Conclusions (1) 1TC/2TC switching timing of the transient performance sequentially turbocharged diesel engine has a very big impact. If you select the wrong time to switch, can lead to switch sequentially turbocharged diesel engine performance parameter in 1TC/2TC relatively large fluctuations occur,[link widoczny dla zalogowanych], compressor surge occurs. More appropriate time to switch is to open the gas valve controlled turbocharger, turbocharger speed to be controlled slightly more than the basic speed of the turbocharger and then open when the air valve controlled turbocharger. (2) 16PA6STC Diesel 1TC/2TC switching process, the gas valve is open to the air from the open valve switch delay time set at 2.4 ~ 3.7S is feasible, the basic supercharger and turbocharger are controlled in proper working condition. In contrast, switching delay time select 2.7S more appropriate. (3) calculation, this paper 16PA6STC diesel engines during the main performance parameters of switching transient curve; the calculated results with experimental data provided by the foreign literature meeting the well proved that the model, using calculation method and the correctness of the parameters identified. Through the simulation method to determine the switch sequentially turbocharged diesel engine 1TC/2TC delay range. The research method and research findings for other marine diesel engines with sequential turbocharging, has the reference value. References: [1] Chen Huaqing, Ao Chenyang. Diesel ship propulsion system model [J]. Ship Engineering ,2000,10:33-37. [2] Du Jianwei, Wang Yinyan. Have real-time simulation model of turbocharged diesel engine [J]. Diesel engines, 20O6 (Suppl) :71-74 .13 JTAUZIAX, PASCALCHESS. Computeraidedstudyofthetransientperformancesofahighlyratedsequentiallyturbt ~ hargedmarinedieselengine [Jj. Prcc [rmtnMechEngrs ,1998,212:185-196. [4] IfETEAJF,[link widoczny dla zalogowanych], PASCALCHESS. PerfonnancesimulationofmarinedieselengineswithSelendla [Jj. JoumalofShipResearch, 1999,43 (4) :201-2l7. (Edit Han Feng)
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