Da Peng Hu
Dalian University of Technology
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Featured researches published by Da Peng Hu.
Advanced Materials Research | 2012
Xiao Dong Zhang; Da Peng Hu; Zong Chang Zhao
In present research ionic liquid, 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]) and water were taken as the new working pair for absorption heat transformer (AHT). The thermodynamic cycle performance for this working pair was simulated based on its thermodynamic data, mass and energy balance for each component in a AHT. The effects of absorption and condensing temperature on the coefficient of performance (COP), exergy efficiency (ECOP), concentration deference between dense and dilution solutions and flow rate ratio were analyzed. The cycle performance comparison for AHT using two working pairs, H2O + [MMIM][DMP] and H2O + LiBr was carried out. The results indicate that the COP and ECOP of AHT for H2O+ [MMIM][DMP] are all lower than those for H2O + LiBr, but they can still reach 0.4 and 0.5 respectively when condensing and generation temperatures are 35 and 90 °C respectively. The excellent physical and chemical properties of ionic liquid mentioned above together with suitable cycle performance make this new working pair to have the potential application in absorption heat pump or absorption heat transformer.
Advanced Materials Research | 2011
Yu Qiang Dai; Jiu Peng Zou; Jin Tao Wu; Che Zhu; Pei Qi Liu; Li Ming Zhang; Da Peng Hu
Real gas effect has great impact on unsteady flow behaviors in wave rotor refrigerator (WRR). In this work, the main thermal separation effect and propagation speed of gasdynamic wave of real gases are briefly studied. Numerical results have shown the large deviations between perfect gas model and real gas model for gasdynamic waves. A corrected wave diagram of WRR has been achieved based on real gas PVT relations, through which the problem of offset design of port timing can be completely solved.
Advanced Materials Research | 2012
Xiao Dong Zhang; Da Peng Hu; Zong Chang Zhao
Three binary solutions composed of ionic liquid (IL), 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM] [DEP]), and selected refrigerants (water, ethanol or methanol) were proposed as new working pairs for absorption heat pumps or absorption refrigerators. The vapor–liquid equilibrium (VLE) data were measured by a static method at different temperatures and at different ILs mole factions and correlated by the None-Random Two Liquids (NRTL) activity coefficient models, and the average relative deviation were less than 3.3%. The solutions showed strong negative deviation from the Raoults Law and were able to absorb vapor of water, ethanol or methanol. The excess enthalpies were measured and correlated at 298.15 K and atmospheric pressure. The results indicated that the mixing of [EMIM] [DEP] with water, ethanol or methanol were exothermal. The proposed solutions were proved to possess one of the fundamental features that a working pair must have in absorption cycle.
Applied Mechanics and Materials | 2014
Jian Hua Zhao; Pei Qi Liu; Da Peng Hu
A study on the flow and separation performance of supersonic gas separator is carried out through numerical simulation and experimentation. The effect of area ratio on the separation performance under low pressure ratio has been researched. The simulation results indicate that with an increase of the area ratio AR, the intensity of the shockwave increases and the location approaches the throat; Shockwaves are absent in the diverging section of the nozzle when area ratio is 1.063 and the pressure ratio is within 1.25-1.75, which reaches the highest separation performance. The calculated and experimental results also show that the separation performance is the highest and can reach 40.82% when pressure ratio is 1.75. The calculated values are in agreement with the experimental results.
Applied Mechanics and Materials | 2013
Zhen Dong Liu; Yu Qiang Dai; Feng Xia Liu; Xiao Bo Xu; Li Zhi Zhu; Wen Wu Chen; Da Peng Hu; Yong Hang Cheng
A novel pre-cyclone jet singlet oxygen generator (PJSOG) has been the focus of research for recent years. In this paper, the high liquid-gas ratio separation performances of PJSOG have been studied by means of theoretical and experimental analysis. The liquid excess of the critical mass concentration portion can be easily captured due to initial BHP particles swirling momentum for a specific designed structure. At high flow speeds, the vacuum mixed Cl2/He with a weak entrainment capability insures high separation efficiency. Large quantities of experiments have verified that the new PJSOG do have the excellent operation performances of high separation efficiency, high O2 (1Δ) output coefficient, high utilization coefficient of Cl2 and excellent operating flexibility and stability. All the results show that the new PJSOG is a feasible and promising technology in singlet oxygen generation cases.
Advanced Materials Research | 2013
Jia Quan Zhao; Da Peng Hu; Pei Qi Liu; Feng Xia Liu; Jin Ji Gao
As a novel generation of thermal separators, the Wave rotor refrigerator (WRR) has replaced the traditional pressure-wave thermal separator. However, the isentropic refrigeration efficiency still needs to be improved compared with expander. A novel WRR system cycle was built and the system performance was thermal analyzed under various parameters, such as expansion efficiency or compression efficiency of wave rotor. The results are used to compare with the traditional WRR system. It is shown that the advantage provided by this novel cycle over the traditional WRR is an expansion process and a compression process is integrated into one unit, with a higher energy transfer efficiency and simple structure. The isentropic refrigeration efficiency of this novel cycle can be more than twice of the traditional WRR under the pressure ratio of 1.1. The experimental works are carrying out.
Advanced Materials Research | 2012
Pei Qi Liu; Li Wei; Wen Jing Zhao; Yu Qiang Dai; Da Peng Hu
The ejector technology is a commonly used in nature gas exploration. In this article the pressure-exchange ejector is introduced and researched to solve the low efficiency problem of common ejector during low pressure ratio condition. The results show that when pressure ratio is kept fixed, ejection rate decreases with the compression ratio increase, an optimum ratio exist; the pressure-exchange ejector have higher isentropic efficiency and ejection rate when the pressure ratio is under three, it also applies to wilder operation condition. It is both practical valuable and theoretical significant to research on pressure-exchange ejector for China’s gas and oil fields.
Advanced Materials Research | 2012
Yu Qiang Dai; Feng Xia Liu; Jiu Peng Zou; Jin Tao Wu; Che Zhu; Xue Wu Liu; Li Ming Zhang; Da Peng Hu
Because of bilateral pulse tubes, wave rotor refrigerators (WRRs) have excellent fluidic operation performance. In this work, a WRR experimental rig with throughput of 3×104Nm3/d and expansion ratio 3 for hydrated gases has been built. A number of experiments show that the temperature of low pressure port of WRR has little influence on refrigeration efficiency. This makes possible of maintaining excellent refrigeration efficiency when WRR operating with high-liquid gases. Actual liquid experiments do show the excellent fluidic operation performance: the refrigeration performance remains almost unchanged even if WWR operates with 13.7 %( w) liquid ratio.
Advanced Materials Research | 2012
Jiu Peng Zou; Feng Xia Liu; Yu Qiang Dai; Jin Tao Wu; Pei Qi Liu; Che Zhu; Li Ming Zhang; Da Peng Hu
Abstract Because of external driving, dynamic pre-cyclone separators have excellent operational performances in areas of pressure vary occasionally. In this work, a numerical model of the dynamic separator been built and the flow field is thoroughly studied. The distribution results of angular velocity show that an appropriate structure of pre-cyclone vanes is of great importance to get a relative uniform flow angular velocity field. A novel structure of pre-cyclone vanes under different separation requirements is developed and verified by a number of experiments.
Advanced Materials Research | 2011
Yu Qiang Dai; Jiu Peng Zou; Che Zhu; Jin Tao Wu; Da Peng Hu
The unsteady flow behaviors in devices like gas wave machines, wave rotor refrigerators and so on are complex due to real gas effect at high operational pressure and low temperature. In this work, a detail computational model for unsteady flow analysis of real natural gases is established. The real effect on unsteady behaviors of natural gases in shock tubes have been studied extensively. Results show that the non-classical flow of the gases will not exist. The discipline of reflection and refraction of various gas waves or discontinuities remain unchanged for natural gases. Attention should be paid only to the deviations between perfect gas model and real gas model for gasdynamic waves.