scholarly journals Research of the radial-axial turbine of the marine diesel engine impulse turbocharging system

Author(s):  
А.В. Пассар ◽  
Д.В. Тимошенко ◽  
А.Н. Бердник

В статье представлены результаты исследований радиально-осевой турбины, работающей в составе импульсной системы наддува среднеоборотного судового дизеля. Исследования носили теоретический и экспериментальный характер и базировались на предлагаемом методе проектирования и расчета, который комбинируя на определенных этапах модели расчета радиально-осевой турбины, а также замкнутую модель рабочего процесса комбинированного двигателя, позволяет решать задачи проектирования проточных частей турбины для работы в нестационарном потоке импульсной системы наддува. Целью исследований является отработка основных положений предлагаемого метода проектирования радиально-осевой турбины, работающей в составе импульсной системы наддува комбинированного двигателя, на примере поиска оптимальных параметров радиально-осевой турбины турбокомпрессора среднеоборотного судового дизеля размерности 18/22. В работе получена модернизированная геометрия проточной части турбины. Представлены результаты экспериментальных и расчетных исследований характеристик модернизированной и штатной турбин, подтверждающие повышение эффективности модернизированной турбины во всем диапазоне ее характеристики. Представлены результаты испытаний судового дизеля 6ЧН 18/22 с модернизированной и штатной турбинами по нагрузочной характеристике, показывающие положительное влияние измененной геометрии турбины на эффективные показатели дизеля и подтверждающие возможность использования предлагаемого метода проектирования радиально-осевой турбины системы наддува комбинированного двигателя. The article presents the results of research on a radial-axial turbine operating as part of a pulsed boost system for a medium-speed marine diesel engine. The research was theoretical and experimental in nature and was based on the proposed design and calculation method, which combines at certain stages of the radial-axial turbine calculation model, as well as a closed model of the combined engine workflow, allows you to solve the problems of designing the flow parts of the turbine for operation in a non-stationary flow of a pulse boost system. The aim of the research is to develop basic provisions of the proposed design method of the radial-axial turbine, which is part of pulse systems boost engine combined, for example, finding the optimal parameters of the radial-axial turbine of the turbocharger, the medium-speed marine diesel dimensions 18/22. The upgraded geometry of the flow part of the turbine is obtained. The results of experimental and computational studies of the characteristics of upgraded and standard turbines are presented, confirming the increase in the efficiency of the upgraded turbine over the entire range of its characteristics. The results of tests of the 6ChN 18/22 marine diesel engine with upgraded and standard turbines on load characteristics are presented, showing the positive effect of the changed turbine geometry on the effective performance of the diesel engine and confirming the possibility of using the proposed method of designing a radial-axial turbine of the combined engine supercharging system.

Fuel ◽  
2016 ◽  
Vol 186 ◽  
pp. 456-465 ◽  
Author(s):  
L. Ntziachristos ◽  
E. Saukko ◽  
K. Lehtoranta ◽  
T. Rönkkö ◽  
H. Timonen ◽  
...  

2011 ◽  
Vol 46 (1) ◽  
pp. 127-132 ◽  
Author(s):  
Zhide Xu ◽  
Sumito Nishio ◽  
Masaru Ikame ◽  
Eiko Ishimura ◽  
Magoshiro Kuwabara

2013 ◽  
Vol 313-314 ◽  
pp. 763-766 ◽  
Author(s):  
Zhen Dong Tan ◽  
Zun Feng Du

Based on the uncertaintyproblem of decision factors in the fault diagnosis and maintenance ofequipment, the fuzzy method and grey theory were introduced. Firstly, fuzzyterms were applied to describe the basic variables (probability of occurrence,severity and detection). Triangular fuzzy number was selected to carry out thequantitative calculation of fuzzy terms and the defuzzification of membershipfunctions. Then the grey correlations of all Failure modes were computed andrisks were ranked, considering the relative importance of decision factors. Thefuel system of marine diesel engine was taken as an example. It is pointed thatalthough the risk priority numbers are equal, if the values or weights ofdecision factors are different, then the risk levels of Failure modes aredifferent as well. The results indicate that the calculation model can identifythe failures of ship equipment more precisely and optimize allocation ofmaintenance resources.


2013 ◽  
Vol 291-294 ◽  
pp. 1920-1924
Author(s):  
Min Xiao ◽  
Hui Chen

The KIVA-3V program was used to make numerical simulation for L21/31 type of medium-speed marine diesel engine about the NOx emissions and the affection of NOx changing process on different variable parameters under the Tier Ⅱstandard. On this basis, a discussion towards the NOx emission of the model fueling with dimethyl ether (DME) to meet the Tier Ⅲ standard is offered. The results show that reducing the intake temperature, load and speed, postponing the fuel injection timing and intake lag angle properly can decrease the NOx emissions within the limits of NOx in TierⅡ standard. Comparing the results of the numerical simulation of DME and diesel fuel, the NOx emission of the former one is 60.85% of the latter one, and the NOx emission of changing variable parameters on DME engine is 35.56% of the original type of diesel engine, very close to the Tier Ⅲ.


2010 ◽  
Vol 2010.16 (0) ◽  
pp. 371-372
Author(s):  
Zhide XU ◽  
Sumito NISHIO ◽  
Masaru IKAME ◽  
Magoshiro KUWABARA

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