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RISS 인기검색어
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- 저자 : Kangyao Deng (검색결과 5 건)
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Design of a variable valve hydraulic lift system for diesel engine
Zhilong Hu,Yong Gui,Min Xu,Kangyao Deng,Yi Cui,Jiayong Dou 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
A continuous variable valve lift (VVL) mechanism for a diesel engine is proposed in this research. The hydraulic mechanism, whichconsists of a driving plunger, a driven plunger, a hydraulic cylinder, and a hydraulic oil tank, is the key part of the VVL mechanism. Simulation is conducted to study the relationship between maximum valve lift and rotation angle of driving plunger. Calculation resultsindicate that the maximum valve lift decreases with increasing rotation angle. A prototype was manufactured and successfully tested in asingle-cylinder diesel engine. The experiments, which were conducted at different rotation angles of the driving plunger, validate theaccuracy of the calculation results. The difference between experimental valve lift curve and cam lift curve is considered the result of oilleakage. Rotating the driving plunger is an effective method to regulate valve lift. Working stability of the VVL mechanism is validatedthrough a multi-cycle operation. Experimental results indicate that the VVL mechanism is effective and reliable for realizing continuousVVL in engines.
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Kun Zhang,Xinyu Huang,Sai He,Kangyao Deng,Yi Cui,Aiqiang Luo 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.6
For turbocharging engines, the structure of the exhaust system directly affects the flow and energy transfer process of the exhaust gas, which has a big influence on the turbocharger performance. To evaluate the performance of various kinds of exhaust systems, two indicators, “available energy loss coefficient” and “pressure wave interference coefficient”, are proposed to evaluate the steady flow loss and transient flow anti-interference characteristics. Two kinds of exhaust system modular, Modular pulse converter (MPC) and Modular multi-purpose pulse converter (MMPC), are analyzed and compared by the three-dimensional calculation. The results show that the MMPC structure has a smaller available energy loss and a better anti-interference performance in the exhaust process. To solve the problems of scavenging interferences and exhaust temperature discrepancy on a highly boosted 8-cylinder marine diesel engine, a Hybrid modular exhaust (HME) system is proposed. Effects of MMPC, HME and MIXPC (Mixed pulse converter) on the engine performance are compared by one-dimensional simulation. This is followed by an engine test for performance comparison between MMPC and HME, which shows that the HME system can effectively relieve the problems of scavenging interference, and the maximum exhaust temperature discrepancy of all cylinders is reduced from 60°C to 31°C under the rated condition.
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A Methodology to Extend the Altitude Adaptability of a Turbocharged Heavy-Duty Diesel Engine
Gu Yuncheng,Ma Zetai,Zhu Sipeng,Yang Mingyang,Deng Kangyao 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.4
This research aims to propose a method to achieve the maximum altitude adaptability of turbocharged diesel engines with the optimum fuel consumption. Firstly, engine performance at different altitudes is studied by experimental method. It is found that the engine power recovery is restricted by three constraints, which are cylinder pressure, exhaust temperature and boosting pressure ratio. Following that, the influence of turbocharging system and fuel injection on the three constraints is studied via experimentally validated numerical model. A power-recovery-zone bounded by the three constraints is proposed, inside which engine power can be fully recovered. The altitude adaptability of the engine is discussed in details via this zone. Further analysis finds that the boosting pressure and the maximum pressure ratio are the key factors to the constraints. A new methodology which can achieve the maximum altitude with the optimum fuel consumption is proposed based the concept of the zone. Finally, the methodology is applied in the engine with three types of turbocharging systems to quantitatively compare their altitude adaptability. Results prove that the altitude adaptability of the engine is notably improved by adapting the proposed method, especially for the two stage turbocharging system.
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Kangbo Lu,Lei Shi,Shuzhan Bai,Chao Ma,Kangyao Deng 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.1
Adopting back-disk impingement cooling is an effective way to cool small radial turbines. The circumferential uneven flow field caused by the volute leads to an uneven distribution of cooling efficiency on the back disk. To improve the uneven distribution, the arrangement of impinging jet holes on the back disk was studied. The numerical simulation results for conjugated heat transfer (CHT) showed that impingement cooling can effectively cool the high-temperature region of the back disk. Due to the influence of the volute, there is a local low-efficiency cooling zone near the volute tongue of the volute. Changing the distribution of the jet holes can effectively reduce local high-temperature zones and improve uneven local cooling. Compared with other schemes, using a 40° phase angle for the seventh hole has the best cooling effect on the back disk, and the uniformity of the cooling efficiency is improved by 18.5 %. After the cooling fluid flows into the mainstream channel of the turbine, the turbine efficiency is reduced by the cooling fluid, and the effect of impingement cooling on the turbine expansion ratio is negligible.
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Huiyan Zhang,Xuyang Tang,Liansong Mu,Lei Shi,Kangyao Deng 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.3
Fixed two-stage turbocharging system matched at high altitude leads to engine performance deterioration at low altitudes due to unreasonable pressure ratio distribution between two stages. In this paper, a thermodynamic model of regulated two-stage turbocharging system is established. Theoretical analysis shows the pressure ratio distribution should lean towards a turbocharger with greater efficiency, and the high-altitude operation intensifies the role of HP stage. Experiments are conducted on an environment simulation test bench. Then, the optimal pressure ratio distribution and ETAR at various altitudes are proposed. Experiment results demonstrate that the turbocharging system boosts sufficient intake air with the optimal ETAR. Compared to that with the fixed turbocharging system, the maximum increment of the overall efficiency is 9.3 % at 0 m and attains 1.5 % at 3000 m. Consequently, the output torque is 100 % recovered below 3000 m, and it exceeds 91 % at 4500 m. Moreover, the optimal ETAR reduces the BSFC under low altitude conditions.
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