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Numerical Study on Internal Nozzle Flow Characteristic of Injector under Hot Fuel Conditions Yang Xie a, Cangsu Xu b Institute of Power-driven Machinery and Vehicle Engineering, Zhejiang University, Hangzhou 310027, China axieyang_auto@163.com, bxcs0929@163.com(corresponding author) Keywords: Temperature; Cavitation; Internal nozzle flow; Numerical simulation; Diesel Abstract.
The current paper presents simulation of internal nozzle flow characteristic under the condition of different temperatures and pressures on the basis of a two-dimensional model with the help of CFD method.
Numerical simulation Fuel.
Simulations were set at atmospheric pressure (nominally 0.1MPa).

Optimization Research on a Nature Gas Engine Compression Ratio Guodong Feng1, Ying Gao, Jun Li，Yan Qin State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China 1838135048@qq.com Keywords: Compression Ratio, Nature Gas Engine, Combustion chamber Abstract: The CNG engine in this paper is developed based on a prototype diesel engine platform.
We designed three different models with different compression ratio for the simulation and the analysis in the condition that other parameters being equal.
Table.1 The engine operating conditions Parameters Speed Pressure Temperature Equivalent ratio Mixture gas Density Value 1400r/min 140KPa 420K 0.67 1.2Kg/m3 As the cylinder calculation in the CFD-WM module of the fire is transient calculation.
The analysis and optimization of the simulation results In the combustion process, the temperature, pressure, flame surface density and the turbulent kinetic energy directly reflect the combustion state under different compression ratio.

Golovitchev .CFD-Based Optimization of a Diesel-fueled Free Piston Engine Prototype for Conventional and HCCI Combustion[C].SAE 2008-01-2423 [3] Mao J, Zuo Z, Li W, et al.
Multi-dimensional scavenging analysis of a free-piston linear alternator based on numerical simulation[J].
Numerical simulation of a spark ignited two-stroke free-piston engine generator [J].
Simulation of a two-stroke free-piston engine for electrical power generation [J].

This environment monitoring system can be extended to other fields of fire control training simulations, and it has a broad application prospect.
Using a CFD Simulation in Designing a Smoke Management System in a Building[C].
Proceedings of the 2006 Winter Simulation Conference, Dec, 2006:2071-2076 [2] Sheng'an Duan, Kaitao Cheng, Quanbo Ge, Chenglin Wen.

Introduction To reduce environmental degradation of Urban Heat Island, many researches regarding to outdoor environment are carried out, such as field measurement, simulation and wind tunnel test.
Yoshida Shinji, Murakami Shuzo and Mochida Akashi et al. developed a new method for predicting the human comfort in outdoor thermal space with the aid of CFD (Computational Fluid Dynamics), integrated with convection, radiation and moisture transport [4].
The ground material is considered to influence the outdoor thermal environment, however, most of the research on the ground material focused on simulation and few constant observation data is published.
Influence of Green Area Ratio on Outdoor Thermal Environment with Coupled Simulation of Convection, Radiation and Moisture Transport.

On the basis of different FEM and CFD calculations regarding temperature field analysis, strength prognosis and fatigue strength an assessment and an evaluation of the achievable performance potential is given.
To realize an economical viable production of all derived variants, firstly, the necessary core and mold geometries were designed, optimized by simulation and finally produced.
Figure 7: Generated hybrid demonstrators in the different material combinations [3] Benefits and achievable potentials Based on the knowledge gained from the material-technical preliminary inquiries of the connection behaviour of the considered material combinations in close co-operation with the partner in research, IAV GmbH Chemnitz, both FEM and CFD-based calculations were carried out to estimate and to evaluate the performance potential of the derived cylinder head variants following the MULAY-Head Concept.

Many researchers have studied the drying process based on mathematical model and simulation in order to predict the temperature and velocity profile of hot air flow in the drying chamber [2-5].
Pimsamarn et al. [3] numerically investigated the distribution of air flow and temperature by using Computational Fluid Dynamics (CFD) of the average exhaust air temperature of 56 °C with air velocity of 1.75 m/s.
Axcell: Simulation Modelling Practice and Theory, Vol. 17 (2009), pp. 871-882.

In term of fluid flow behaviour, low Re no. calculated from the gained data shows that the entrapped water in the cavity had laminar flow. 0.2Hz 1.0Hz 2.0Hz Fig. 3 Scatterplot of Displacement Fig. 4 Simulation of the oscillating membrane and Input frequency, fin Fig. 5 Fig. 6 Conclusion The Re numbers obtained from the pre-determined input frequency range was between 14 and 35.
Despite obtaining these numbers, the more accurate data of the laminar flow such as the fluid velocity could be anticipated using computational fluid dynamic (CFD) simulation approach.

., A New Whole Wall R-value Calculator, An Integral Part of the Interactive Internet Based Building Envelope Materials Database for Whole-Building Energy Simulation Programs, 2004
Clarke, Energy Simulation in Building Design, Adam Hilger Ltd, UK, 1985
Frank, Experimental and numerical thermal analysis of a balcony board withintegrated glass fibre reinforced polymer GFRP elements, Energy and Buildings 39 (2007) 76–81 [7] FLOVENT, CFD (computational fluid Dynamics), 3D Airflow Modeling Software, Mentor graphics corporation, USA, Version 9.1, 2011.

In this study, the fluid flow through the cancellous structure is studied by CFD.
The basic arrangement of the cancellous bone in the simulation was based on the experimental setup that studies the fluid flow in the cancellous bone.
For each simulation, the velocity and pressure values along the centerline of the cylinder were taken.
Flow structure simulation All the models were meshed in Gambit.
The simulation was performed under static pressure with constant volumetric flow rate of 100ml/h.