Theoretical and Experimental Study of a Micro Jet Engine Start-Up Behaviour

Paper presents the results from development and successful testing of a 200 kW POGT prototype. There are two major design features that distinguish POGT from a conventional gas turbine: a POGT utilizes a partial oxidation reactor (POR) in place of a conventional combustor which leads to a much smaller compressor requirement versus comparably rated conventional gas turbine. From a thermodynamic perspective, the working fluid provided by the POR has higher specific heat than lean combustion products enabling the POGT expander to extract more energy per unit mass of fluid. The POGT exhaust is actually a secondary fuel gas that can be combusted in different bottoming cycles or used as synthesis gas for hydrogen or other chemicals production. Conversion steps for modifying a 200 kW radial turbine to POGT duty are described including: utilization of the existing (unmodified) expander; replacement of the combustor with a POR unit; introduction of steam for cooling of the internal turbine structure; and installation of a bypass air port for bleeding excess air from the compressor discharge because of 45% reduction in combustion air requirements. The engine controls that were re-configured for start-up and operation are reviewed including automation of POGT start-up and loading during light-off at lean condition, transition from lean to rich combustion during acceleration, speed control and stabilization under rich operation. Changes were implemented in microprocessor-based controllers. The fully-integrated POGT unit was installed and operated in a dedicated test cell at GTI equipped with extensive process instrumentation and data acquisition systems. Results from a parametric experimental study of POGT operation for co-production of power and H2-enriched synthesis gas are provided.

Download Full-text

Experimental study of heat transfer and start-up of loop heat pipe with multiscale porous wicks

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2017.01.084 ◽

2017 ◽

Vol 117 ◽

pp. 782-798 ◽

Cited By ~ 27

Author(s):

Xianbing Ji ◽

Ye Wang ◽

Jinliang Xu ◽

Yanping Huang

Keyword(s):

Heat Transfer ◽

Experimental Study ◽

Heat Pipe ◽

Loop Heat Pipe ◽

Start Up

Download Full-text

Experimental study on capability and start-up characteristic of advanced secondary passive residual heat removal system

Progress in Nuclear Energy ◽

10.1016/j.pnucene.2021.103929 ◽

2021 ◽

Vol 140 ◽

pp. 103929

Author(s):

Qianhua Su ◽

Haiyan Xu ◽

Donghua Lu ◽

Xiaohang Wu ◽

Xi Yao ◽

...

Keyword(s):

Experimental Study ◽

Heat Removal ◽

Start Up ◽

Heat Removal System ◽

Removal System ◽

Residual Heat

Download Full-text

Optimization of a Common Rail Diesel Engine Start-up Process

10.4271/2004-01-0119 ◽

2004 ◽

Author(s):

Fuyuan Yang ◽

Jingyong Zhang ◽

Qiang Han ◽

Minggao Ouyang

Keyword(s):

Diesel Engine ◽

Common Rail ◽

Start Up ◽

Engine Start

Download Full-text

Experimental Study of the Jet Engine Exhaust Flow Field of Aircraft and Blast Fences

PROMET - Traffic&Transportation ◽

10.7307/ptt.v27i2.1545 ◽

2015 ◽

Vol 27 (2) ◽

pp. 181-190 ◽

Cited By ~ 2

Author(s):

Haifu Wang ◽

Liangcai Cai ◽

Xiaolei Chong ◽

Hao Geng

Keyword(s):

Experimental Study ◽

Flow Field ◽

Wind Velocity ◽

Maximum Rate ◽

Dynamic Pressure ◽

Jet Flow ◽

Engine Exhaust ◽

Jet Engine ◽

Jet Nozzle

A combined blast fence is introduced in this paper to improve the solid blast fences and louvered ones. Experiments of the jet engine exhaust flow (hereinafter jet flow for short) field and tests of three kinds of blast fences in two positions were carried out. The results show that the pressure and temperature at the centre of the jet flow decrease gradually as the flow moves farther away from the nozzle. The pressure falls fast with the maximum rate of 41.7%. The dynamic pressure 150 m away from the nozzle could reach 58.8 Pa, with a corresponding wind velocity of 10 m/s. The temperature affected range of 40°C is 113.5×20 m. The combined blast fence not only reduces the pressure of the flow in front of it but also solves the problems that the turbulence is too strong behind the solid blast fences and the pressure is too high behind the louvered blast fences. And the pressure behind combined blast fence is less than 10 Pa. The height of the fence is related to the distance from the jet nozzle. The nearer the fence is to the nozzle, the higher it is. When it is farther from the nozzle, its height can be lowered.

Download Full-text

Modeling Viscous Isothermal Piston Skirts EHL in Very Low Initial Engine Start Up Speeds

ASME/STLE 2011 Joint Tribology Conference ◽

10.1115/ijtc2011-61012 ◽

2011 ◽

Cited By ~ 1

Author(s):

Syed Adnan Qasim ◽

M. Afzaal Malik

Keyword(s):

Film Thickness ◽

Elastohydrodynamic Lubrication ◽

High Viscosity ◽

Solution Technique ◽

Engine Operation ◽

Low Speed ◽

Start Up ◽

Speed Optimization ◽

Piston Skirts ◽

Engine Start

In the normal low-speed engine operation, elastohydrodynamic lubrication (EHL) of piston skirts and lubricant rheology reduce friction and prevent wear. In a few initial start up cycles, a very low engine speed and absence of EHL cause adhesive wear. This study models hydrodynamic and EHL of piston skirts in the initial very low cold engine start up speed by using a high viscosity lubricant. The 2-D Reynolds equation is solved and inverse solution technique is used to calculate the pressures and film thickness profiles in the hydrodynamic and EHL regimes, respectively. The work is extended to investigate the effects of three very low initial engine start up speeds on the transverse eccentricities of piston skirts, film thickness profiles and pressure fields in the hydrodynamic and EHL regimes. Despite using a viscous lubricant, thin EHL film profiles are generated at low start up speeds. This study suggests very low speed optimization in the cold initial engine start up conditions to prevent piston wear under isothermal conditions.

Download Full-text

Particulate Matter Emissions during Engine Start-Up

Nanoparticle Emissions From Combustion Engines - Springer Tracts on Transportation and Traffic ◽

10.1007/978-3-319-15928-7_5 ◽

2015 ◽

pp. 47-60 ◽

Cited By ~ 1

Author(s):

Jerzy Merkisz ◽

Jacek Pielecha

Keyword(s):

Particulate Matter ◽

Start Up ◽

Particulate Matter Emissions ◽

Engine Start

Download Full-text

Parametric Investigation of Dual-Mass Flywheel Based on Driveline Start-Up Torsional Vibration Control

Shock and Vibration ◽

10.1155/2019/3171698 ◽

2019 ◽

Vol 2019 ◽

pp. 1-12 ◽

Cited By ~ 4

Author(s):

Liupeng He ◽

Changgao Xia ◽

Sida Chen ◽

Jiwei Guo ◽

Yi Liu

Keyword(s):

Torsional Vibration ◽

Torsion Angle ◽

Torsional Stiffness ◽

Rotary Inertia ◽

Research Model ◽

Attenuation Effect ◽

Start Up ◽

Design Requirements ◽

Simulation Results ◽

Engine Start

This paper is aimed to investigate the influence of dual-mass flywheel (DMF) kinetic parameters on driveline torsional vibration in engine start-up process, which prescribes the design requirements under start-up condition for DMF matching. On the basis of driveline excitation analysis during engine start-up, the analytical model of DMF driveline torsional vibration system is built and simulated. The vehicle start-up test is conducted and compared with the simulation results. On account of the partial nonstationary characteristic of driveline during start-up, the start-up process is separated into 3 phases for discussing the influence of DMF rotary inertia ratio, hysteresis torque, and nonlinear torsional stiffness on attenuation effect. The test and simulation results show that the DMF undergoes severe oscillation when driveline passes through resonance zone, and the research model is verified to be valid. The DMF design requirements under start-up condition are obtained: the appropriate rotary inertia ratio (the 1st flywheel rotary inertia-to-the 2nd flywheel rotary inertia ratio) is 0.7∼1.1; the interval of DMF small torsion angle should be designed as being with small damping, while large damping is demanded in the interval of large torsion angle; DMF should be equipped with low torsional stiffness when working in start-up process.

Download Full-text