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Zhang Y.,North University of China | Liu X.-Y.,North University of China | Shi Z.-Y.,North General Power Group Co. | Su T.-X.,North University of China
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering

To investigate effect of connecting rod small end oil hole machining deviation on fatigue safety coefficient, firstly setting values of the oil hole machining deviation according to the practical production process, a geometrical model was constructed and used to compute stress and its distribution in the connecting rod under different machining deviations based on the finite element modem (FEM), the normal stress in each position and the minimum safety coefficient of the connecting rod under different machining deviations were obtained by critical plane approach and Goodman fatigue limit diagram, separately. It is revealed that for the connecting rod made of quality alloy steel, its fatigue safety coefficient is greatly affected by machining quality of small end oil hole. The fatigue safety coefficient decreases by 10.3% with the surface roughness increasing from Ra3.2 to Ra 8.0, and by 9.0% with the oil hole outlet rounding radius decreasing from 2 mm to 0. Source

Dong Q.,Harbin Engineering University | Fan L.-Y.,Harbin Engineering University | Bao D.-M.,Zhenjiang Ship Equipment Co. | Yang W.-H.,North General Power Group Co. | And 3 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering

Droplet characteristic information of the conical spray injected from outward-opening injector was recorded by Phase Doppler Particle Analyzer (PDPA) and analyzed by using Time Dividing Method. Results indicate that the change of ambient pressure affects velocities and sizes of spray droplets significantly. When in ambient pressure of 1.1 MPa, the peak value of mean droplet velocity for whole spray, whether in the front or the end, is not more than 20 m/s. The ambient pressure increase improves air mass flow rate entering into the conical spray, that enlarges droplet diameter distribution range and its standard deviation. In ambient pressure of 1.1 MPa, when injection finished (in phase T) the droplet velocity becomes 0 m/s, AMD and SMD keep at about 20 μm and 40 μm respectively. Increase of injection pressure benefits spray droplet fining further. Meanwhile, enlargement of pintle seat angle has not obvious effect on the droplet velocity, but it can reduce the SMD for phases F, C and R significantly. Source

Hou J.B.,North University of China | Deng X.F.,North University of China | Tian R.N.,North University of China | Hou J.B.,North General Power Group Co.
Applied Mechanics and Materials

The effects of electric current, the altitude of the liquid outlet and liquid level change within crucible in direct-current electromagnetic pump (EMP) used to quantitative pouring of aluminum alloy on flow rate were studied. The results show that the effects of electric current on flow rate is affected by the hydraulic resistance; flow rate decrease with the increasing of the altitude of liquid outlet; when the output of aluminum alloy is large, the liquid level change within crucible have a significant impact on flow rate. © (2013) Trans Tech Publications, Switzerland. Source

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