Shijiazhuang, China
Shijiazhuang, China

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Zhang C.-L.,Beijing BITEC Co. | Liu F.-S.,Beijing Institute of Technology | Shang H.-K.,Hebei Huabei Diesel Engine Co. | Wang P.,Beijing Institute of Technology | And 2 more authors.
Binggong Xuebao/Acta Armamentarii | Year: 2015

For low oil pressure in diesel engine at plateau, the lubrication system of the diesel engine is researched through experimental test, theoretical analysis and CFD simulation. The results show that the ambient pressure affects the basic pressure in the whole oil passage. The inlet pressure of the oil pump equivalently decreases with the increase in altitude, resulting in lower ambient pressure. In this condition, asuction appears in the pump, which may reduce the main oil pressure significantly. As the flow rate keeps constant, the pipe flow loss decreases gradually with the increase in pipe diameter. Though the flow loss rate becomes smaller, the right angle junction has great influence on the flow loss, and for r/R≥1.5, the change of flow loss tends to be stabile. The plateau test results show that the engine oil pressure of the improved scheme is increased by about 30% at low rotating speed, and the oil pressure is increased by more than 50% at medium and high rotating speeds. ©, 2015, China Ordnance Society. All right reserved.


Su L.,Beijing Institute of Technology | Li X.,Beijing Institute of Technology | Li J.,Hebei Huabei Diesel Engine Co. | Zhao L.,Beijing Institute of Technology | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013

Due to the growing importance of future emission restrictions, diesel engines are continuously forced to improve the combustion processes in order to reduce the raw emissions, especially for the emitted particulate matters (PM) and nitrogen oxidants (NOx). For the combustion formation and emission characteristics of diesel, fuel-air mixing plays a controlling role and one of the factors that affect the fuel-air mixing is the design of the combustion chamber. Therefore, a serious of investigations concerned on the geometric shape of combustion chamber have been carried out and some of them have shown well emission characteristics. Double Swirl Combustion System (DSCS) has been reported to have a well performance on fuel conservation and combustion reaction in past literatures, but its performance on emission has not studied yet. It can be hypothesized that fuel spray can collide with the circular ridge, splits into two parts, and then forms double swirls (inner-swirl and outer-swirl), which makes the core of the single spray to meet air directly. Hence, the fuel will be distributed more evenly and the fuel-air mixing and burning progress can be improved for achieving better usage of the air in the whole chamber, It is hypothesized that the generation of soot (main section of PM) can be reduced effectively duo to this progress. To verify the hypothesis, the emission characteristics of diesel engine adopted DS chamber and the original chamber were tested in present paper. The engine tests were based on a 132-mm single-cylinders diesel engine, the corresponding stroke length is 145 mm, connecting rod length is 262 mm, and the maximum engine speed is 2500 r/min. The PM level in the exhaust gas was measured with a MAHA MPM-4 PM analyzer, the readings of which are provided as PM concentration in mg/m3, whose accuracy within ±0.01 mg/m3. The NOx concentration in ppm (parts per million, by vol.) in the exhaust was measured with a HORIBA MEXA-720 NOx analyzer with the accuracy within ±1×10-6. The test was conducted at 1300 r/min (full load), 1600 r/min (25% load, 50% load, 75% load, full load), 1900 r/min (full load) and 2100 r/min (rated speed, full load). The 1300 r/min, 1600 r/min, 1900 r/min correspond to the engine speed A, B, C ruled in the European Stationary Cycle (ESC) test. The weight of each engine speed (A, B, C) in the ESC test are 23, 39, 23, so different loads of engine speed B (1600/min) were tested in our research to study the emission characteristic of the test engine. The emitted PM, NOx, brake specific fuel consumption and cylinder pressure had been measured. Meanwhile, the rate of heat release and mean cylinder temperature had been analyzed in both original diesel engine and the diesel engine matched with DSCS. The test results (full load) show that the PM emitted by the engine matched with DSCS is significantly lower than the original, with the reduction being higher at high engine speed in the range of 7%~47%. While the emitted NOx of the engine matched with DSCS is higher than the original. The test results (25% load, 50% load, 75% load, full load at 1600 r/min) indicated that the emitted PM and NOx differ slightly at lower load, and the reason can be explained as: the penetration of the fuel spray is short due to the reductive fuel supply and the fuel can hardly touch the ridge of the DS chamber, so the fuel were combusted unrestrained in both DS chamber and the original chamber which result a similar combustion process and emission characteristic. Besides, the penetration would become longer with the increase of fuel supply as the load increased and the fuel spray can collide with the ridge adequately via which the emitted PM can be significantly reduced.


Gao H.,Beijing Institute of Technology | Li X.,Beijing Institute of Technology | Geng W.,Hebei Huabei Diesel Engine Co. | Zhao L.,Beijing Institute of Technology | And 2 more authors.
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2014

For the purpose of optimizing the emission characteristics of a double swirl combustion chamber with a throat size of 96 mm, tests were carried out for selecting a proper spray angle. The spay angles of 155° and 160° were applied for testing an oil sprayer. The data from the tests of the general performance and partial load property showed that, when the spay angle is 155°, the concentration of the particle is lower than that at 160° by 0.02~0.27 mg/m3, and the NOx concentration is higher by 14×10-6~70×10-6 (10-6 of the ratio between NOx and the total emitted gas). The emission results were explained by the experimental data and the formation mechanism of the above emission characteristics was explained by the simulation analysis. The research shows that the emission of the particle may be effectively reduced by the application of a spray angle of 155°; in addition, if NOx is processed outside of the cylinder, the CHN4 emission level may be realized.


Wang P.,Beijing Institute of Technology | Liu F.-S.,Beijing Institute of Technology | Shang H.-K.,Hebei Huabei Diesel Engine Co. | Li X.-R.,Beijing Institute of Technology | And 2 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2014

In a DI diesel engine equipped with electronic unit pump (EUP), simulation analysis and experimental investigation were conducted to examine influences of cam profile, diameters of plunger and nozzle hole on engine emission characteristics. Results show that obvious improvement in original engine emissions are obtained by adopting optimized combination of optimized decelerating cam profile with plunger diameter of 11 mm and nozzle hole diameter of 0.21 mm, particulate emission decreases by over 80%, satisfying China IV emission regulation, and realizing the expected objective. ©, 2014, Chinese Society for Internal Combustion Engines. All right reserved.


Zhu Z.-X.,Beijing Institute of Technology | Zhang F.-J.,Beijing Institute of Technology | Wu T.-T.,Beijing Institute of Technology | Han K.,Beijing Institute of Technology | And 4 more authors.
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2015

Zero-D predictable combustion model on the basis of neural network was put forward, which is appropriate to the combustion prediction for both steady and dynamic engine simulation. Main procedures for building a predictable model were introduced, including calculation for the rate of heat release(RoHR), parameterization for RoHR, establishing and training the neural network. Firstly, the in-cylinder pressure curve was smoothed using average method and the RoHR was obtained by thermodynamics. Then, mathematical algorithms were adopted to fit the RoHR in tri-Wiebe function. To solve the multiple solutions in fitting, some constraints were put forward by analysis of parameters meanings. Lastly the radial basis function(RBF)neutral network was established and trained to complete the zero-D predictable combustion model. The accuracy of the model was validated by the training error analysis and comparison between predicted results and experimental data. ©, 2015, Chinese Society for Internal Combustion Engines. All right reserved.


Zhang Z.,Beijing Institute of Technology | Liu F.,Beijing Institute of Technology | Du W.,Beijing Institute of Technology | Wang P.,Beijing Institute of Technology | And 2 more authors.
IEEE Transportation Electrification Conference and Expo, ITEC Asia-Pacific 2014 - Conference Proceedings | Year: 2014

The start process of multi-cylinder diesel engine has been experimental investigated in this paper. With a fixed injection duration, the start experiment is performed with different injection timing. Then, with a fixed injection timing, the experiment of the starting moment is performed with different injection duration. Based on the above experiment data and the calculation method, the matching strategy for the transmission system is put forward as well as corresponding injection strategy. © 2014 IEEE.


Jiao L.,Hebei Huabei Diesel Engine Co. | Ge B.,Hebei Huabei Diesel Engine Co. | Zhang Y.,Hebei Huabei Diesel Engine Co. | Xu X.,Hebei Huabei Diesel Engine Co. | Sun S.,Hebei Huabei Diesel Engine Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Wear cause of the 20CrMnTi steel monoblock pump camshaft was analyzed by means of macroscopic examination, lubricating oil property test, chemical compositions analysis, mechanical property test, metallographic examination and microhardness test. The results show that the main reason for the surface wear of the camshaft is attributed to the hard and brittle blocky and network carbide in the surface layer which reduces the contact fatigue strength of the camshaft journals and increases the probability of the spalling along grain boundary. Secondly, the secondary quenched martensite after grinding leads to the crack and brittle spalling on the basis of the structure defects. The spalled particles are play intensive abrasion role and lead to the early wear failure of the monoblock pump camshaft. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Jiao L.,Hebei Huabei Diesel Engine Co. | Wang G.,Hebei Huabei Diesel Engine Co. | Xu X.,Hebei Huabei Diesel Engine Co. | Ge B.,Hebei Huabei Diesel Engine Co. | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Fracture cause of the crankshaft was analyzed by means of macroscopic examination, chemical compositions analysis, mechanical property test, metallographic examination and fracture analysis. The results show that the rough cutting marks led to the original damage of the material because of the stress concentration. The combination of cutting marks and ferrite with low hardness in transition region of induction hardening makes the cracks initiate and propagate and to be the main reasons of the fracture. Upper bainite existing in the matrix reduces the mechanical properties to some extent. Finally, the crankshaft occurs high cycle fatigue fracture under alternating stress. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Zhang L.,University of Science and Technology Beijing | Pan K.,University of Science and Technology Beijing | Pan K.,Henan University of Science and Technology | Du W.,University of Science and Technology Beijing | And 5 more authors.
Intermetallics | Year: 2014

The ordered intermetallic Mo5SiB2 displays a ceramic-like brittleness at the ambient temperature. The state density, charge distribution and elastic parameters were calculated by first-principles, based on the density functional method. The results indicated that the two different kinds of covalent bonds were intricately woven into the refractory phase. The improved Peierls-Nabarro stress which is caused by this kind of distribution mode makes dislocations move difficultly, resulting in intrinsic brittleness. The effects of substitutional alloying on the ductility of Mo 5SiB2 were also assessed by the calculations on the elastic properties and dislocation line energy. It was shown that the metal (Nb, Tc) alloying was not to enhance effectively its toughness, but to improve the brittle-to-ductile transition temperature. © 2014 Elsevier Ltd. All rights reserved.


Shang H.,Hebei Huabei Diesel Engine Co. | Huang Y.,University of Science and Technology Beijing | Hou Y.,University of Science and Technology Beijing | Zhang L.,University of Science and Technology Beijing | Lin J.,University of Science and Technology Beijing
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Effects of Si content on microstructure, hardness and fracture toughness at room temperature of intermetallic compounds for Mo-Si binary system fabricated by arc melting technology were investigated. The results show that with the increase of the Si content, the number of cracks and pores increases and relative density decreases. Si element determines the morphology of transition phases of arc-melted intermetallic compounds of the Mo-Si system. For lower content of Si, transition phase is island-like and dispersively distributed, whereas in case of higher content of Si, transition phase is reticularly distributed within matrix. Hardness and fracture toughness at room temperature decrease with increasing the content of Si. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.

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