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Yan W.-S.,Kunming University of Science and Technology | Chen H.,Kunming University of Science and Technology | Shen L.-Z.,Kunming University of Science and Technology | Yang Y.-Z.,Kunming Yunnei Power Co. | Lei J.-L.,Kunming University of Science and Technology
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2012

In order to clear effect of atmospheric pressure on performance and emissions of the diesel engine fueled with diesel oil mixed by 15% hydrous ethanol, comparative tests on bench were conducted in a turbocharged diesel engine fueled separately with pure diesel oil and E15 hydrous diesel/ethanol blend under different atmospheric pressures. Results indicate that with the atm. pressure rising, engine power is slightly increased; the brake specific fuel consumption b e gets great improvement with the atm. pressure rising from 81 kPa to 90 kPa, while with it rising from 90 kPa to 100 kPa, the improvement lowers; and the atm. pressure rising has little influence on b e in low load condition but has remarkable influence in middle and high load conditions. At 81 kPa atm. pressure, HC and CO emissions go up significantly in low and middle load conditions, but with atm. pressure rising it gets remarkable improvement, meanwhile in high load conditions the HC and CO emissions trend to diesel engine level or worse. The atm. pressure has little influence on NO x emissions, but NO x emissions have a slight drop at all load conditions. When the atm. pressure declines below 90 kPa, the smoke has a remarkable drop compared to that of diesel engine. When the atm. pressure is over 90 kPa, the improving effect weakens.


Ma Z.,Kunming University of Science and Technology | Bi Y.,Kunming University of Science and Technology | Shen L.,Kunming University of Science and Technology | Lei J.,Kunming University of Science and Technology | And 2 more authors.
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2016

Exhaust manifold is a main heated component of engine, which has poor working conditions. High levels of thermal load can lead to deformation even cracking, which affect its normal working and reliability and durability. Aiming at the high thermal load of a high pressure common rail diesel engine, different fluid-solid coupling models was built and the temperature distribution and thermal stress of the engine exhaust manifold was stimulated and the influence of different structural factors on the exhaust manifold thermal load was calculated and analyzed. Results show that: the maximum temperature of the exhaust manifold changed from 805.2 ℃ to 820.8 ℃ as the outlet length increased, the maximum temperature of the exhaust manifold changed from 805.2 ℃ to 819.4 ℃ as the outlet diameter increasing, and the maximum temperature of the exhaust manifold dropped to 784.0 ℃ as the outlet transferred to the body symmetry position. Structure factors such as exhaust outlet position, outlet length and outlet diameter had a great influence on the exhaust manifold thermal load. The maximum thermal stress value was 326.21 MPa of the case of 21 mm outlet length and 5 mm outlet diameter outlet with the non-symmetry outlet position; the minimum thermal stress value was 174.1 MPa of the case of 19mm outlet length and 5mm outlet diameter with the non-symmetry outlet position. © 2016, Journal of Mechanical Strength. All right reserved.


Li L.,Kunming University of Science and Technology | Yu K.,Kunming University of Science and Technology | Li Y.,Kunming Yunnei Power Co.
Lecture Notes in Electrical Engineering | Year: 2012

In the manufacturing industry, each enterprise will encounter in the negative inventory balances problem in the warehouse management. The problems of negative inventory balances management, has become the bottleneck of processing flexibility of storage services. Allowing negative balances, it will facilitate delivery of cargo from storage rather than management. Does not allowing negative balances, it will facilitate management rather than delivery of cargo from storage. Aiming at this problem, this paper discusses the causes of negative inventory balances and the corresponding solutions, and we proposed some suggestions about treating the phenomenon of negative inventory balances. © 2012 Springer-Verlag.


Lei J.,Kunming University of Science and Technology | Qin Z.,Kunming University of Science and Technology | Jia D.,Kunming University of Science and Technology | Song G.,Kunming Yunnei Power Co. | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2015

The helical intake port geometry directly controls swirl ratio, volumetric efficiency and combustion characteristics as well as emissions reduction of diesel engine. A new digital design method of helical intake port was studied. In this method, cylinder head structure was considered as a constraint condition, and the swirl ratio was considered as the design target; then the flow coefficient was optimized. The effect of the geometry structure and port sensitive areas of diesel engine helical intake port on the intake port flow characteristics was analyzed, and several key structural parameters of helical intake port were defined. As a result, a parameterized mathematical model of helical intake port was established. Based on parameterized mathematical model of helical intake port and several key structural parameters of helical intake port, a digital modeling software about diesel engine helical intake port was developed. For the design requirements of helical intake port of self-developed horizontal two-cylinder diesel engine, a digital 3D model of helical intake port was established by using the helical intake port digital modeling software, and model smoothness and flow characteristics of this 3D model were analyzed. The results show that helical intake port digital design method has a certain feasibility and versatility. Just providing with the design requirements of the cylinder head structure and flow characteristics (swirl ratio and flow coefficient), a helical intake port that meets the requirements can be designed through using the digital design method and modeling software. ©, 2015, Chinese Society of Agricultural Machinery. All right reserved.


Li L.,Kunming University of Science and Technology | Yu K.,Kunming University of Science and Technology | Li Y.,Kunming Yunnei Power Co.
Advances in Intelligent and Soft Computing | Year: 2012

In the manufacturing industry, negative inventory balances is an especially sticky subject for each enterprise. If enterprise does not allow negative inventory balances, that will affect transfer speed of logistics and information, but allowing negative inventory balances will exist inventory inaccurate risk. This paper mainly analyzed in the inaccurate problems caused by calculating inventory costs based on allowing negative inventory balances exists, and how to improved algorithm to solve them. © 2012 Springer-Verlag GmbH.


Li J.Q.,Southwest forestry University | Wang Y.Y.,Southwest forestry University | He S.C.,Kunming Yunnei Power Co. | Yan H.B.,Kunming Yunnei Power Co. | He C.,Southwest forestry University
MATEC Web of Conferences | Year: 2016

Due to their adverse health effects and their abundance in urban areas, diesel exhaust ultrafine particles caused by the aftertreatment devices have been of great concern in the past years. An experiment of particles number emissions was carried out on a high-pressure, common rail diesel engine with catalytic diesel particle filter (CDPF) to investigate the impact of CDPF on the number emission characteristics of particles. The results indicated that the conversion rates of CDPF is over 97%. The size distributions of particles are bimodal lognormal distributions downstream CDPF at 1400 r/min and 2300 r/min. CDPF has a lower conversion rates on the nucleation mode particles. The geometric number mean diameters of particles downstream CDPF is smaller than that upstream CDPF. © 2016 The Authors, published by EDP Sciences.


He C.,Southwest forestry University | Li J.Q.,Southwest forestry University | Wang Y.Y.,Kunming Yunnei Power Co.
Applied Mechanics and Materials | Year: 2013

Vehicle emissions and their control (VEC) is an important course for majors about automobiles, such as vehicle engineering, Automobile Service Engineering and thermal energy and power engineering. In order to meet the development of automobile technology and culture the corresponding talents, the teaching method should be reformed and innovated. In this paper, the difficulties in VEC course teaching were summarized and analyzed, and the countermeasures and suggestions were put forward. The course content was redesigned and the laboratory experiment was re-arranged. The innovation training program of students was put forward. Some pedagogical techniques and evaluation methods for VEC course were proposed. © (2013) Trans Tech Publications, Switzerland.


Zhou J.,South China University of Technology | Li L.,South China University of Technology | Hu Y.,Guangxi University of Technology | Wang M.,Kunming Yunnei Power CO.
Materials Science Forum | Year: 2011

The article points out the television plastic part size, giving the general design route, then describing the general design process of television back shell by Pro/E. The mold design also is introduced, including mold cavity distrubition, size determining of cavity mold and punch mold, selection of mold frame, set of pushing rod and stripping, sizes of part and mold, side core-drawing mechanism, cooling system design, mold's assembly, through simulation, the mold's design can be determined whether good or bad.


Li G.-J.,Kunming Yunnei Power Co.
Zhuzao/Foundry | Year: 2015

The effect of graphitization and high sulfur nitrogen recarburizer on mechnical properties of engine cylinder head was studied. The production test show that tensile strength of separately cast bar was increased 50 MPa, hardness was increased HBS10, the processing performance of cylinder head was improved, the production cost was decreased. © 2015, Chinese Mechanical Engineering Society. All right reserved.


Ye N.-Y.,Tongji University | Ni J.-M.,Tongji University | Shi X.-Y.,Tongji University | Yang Y.-Z.,Kunming Yunnei Power Co. | And 2 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2011

In view of existing CAE problems in integrity, timeliness and validity, a method to use effectively the CAE technology for developing engine product was proposed to upgrade development capacity of engine manufacturers. That included establishing "Car-Engine-Subsystem-Component" developing mode from systematicness and integrity angle of engine product development, redefining engine CAE technology content, and incorporating CAE application process into business process management and building CAE application flowcharts. As an insistence, this method was used in the EGR development to build EGR comprehensive development flowchart for guiding engine post-processing system design. Results show that this method promotes overall R&D level effectively of the enterprise.

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