Development of a Single Cylinder Compression Ignition Research Engine

Chen, Simon K.; Flynn, P. F.

doi:10.4271/650733

Cited by 235 publications

(74 citation statements)

References 4 publications

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“…All necessary model constants were estimated by the authors -they are based on previous experience (internal reports [30,31]. Mechanical efficiency was calculated using GT -Power formula based on Chen -Flynn model [7], which includes dependency on engine speed, engine square speed and in -cylinder maximum pressure. Regarding intercooler models (LP and HP), they were built in such a way that outlet fluid temperature was constant (taking into account the temperature of water cooling system dedicated to intake air cooling) while pressure loss at nominal power is approximately 3 -5 kPa.…”

Section: Engine Modelmentioning

confidence: 99%

Optimization of 2‑Stage Turbocharged Gas SI Engine Under Steady State Operation

Vítek¹,

Máček²,

Klima³

et al. 2017

Journal of Middle European Construction and Design of Cars

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The proposed paper deals with an optimization of a highly-turbocharged large-bore gas SI engine. Only steady state operation (constant engine speed and load) is considered. The paper is mainly focused on theoretical potential of 2-stage turbocharging concept in terms of performance and limitation. The results are obtained by means of simulation using complex 0-D/ 1-D engine model including the control algorithm. Different mixture composition concepts are considered to satisfy different levels of NOx limit - fresh air mixed with external cooled EGR is supposed to be the right approach while optimal EGR level is to be found. Considering EGR circuit, 5 different layouts are tested to select the best design. As the engine control is relatively complex (2-sage turbocharger group, external EGR, compressor blow-by, controlled air excess), 5 different control means of boost pressure were considered. Each variant based on above mentioned options is optimized in terms of compressor/turbine size (swallowing capacity) to obtain the best possible BSFC. The optimal variants are compared and general conclusions are drawn.

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Section: Engine Modelmentioning

confidence: 99%

Optimization of 2‑Stage Turbocharged Gas SI Engine Under Steady State Operation

Vítek¹,

Máček²,

Klima³

et al. 2017

Journal of Middle European Construction and Design of Cars

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“…The geometry data for the expander model were obtained from a physical device that was installed in the test rig. The heat transfer (HT) correlation suggested by Morel and Keribar for internal combustion engines was implemented for in-cylinder HT [14], while the friction model used was that proposed by Chen and Flynn [15]. the expander engaged were also performed to validate the potential power output with the current expander design and the severity of the oil contamination.…”

Section: Piston Expander and Exhaust Gas Recirculation Boiler Simulatmentioning

confidence: 99%

Performance Analysis of a Reciprocating Piston Expander and a Plate Type Exhaust Gas Recirculation Boiler in a Water-Based Rankine Cycle for Heat Recovery from a Heavy Duty Diesel Engine

Latz

Erlandsson²,

Skåre³

et al. 2016

Energies

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Abstract:The exhaust gas in an internal combustion engine provides favorable conditions for a waste-heat recovery (WHR) system. The highest potential is achieved by the Rankine cycle as a heat recovery technology. There are only few experimental studies that investigate full-scale systems using water-based working fluids and their effects on the performance and operation of a Rankine cycle heat recovery system. This paper discusses experimental results and practical challenges with a WHR system when utilizing heat from the exhaust gas recirculation system of a truck engine. The results showed that the boiler's pinch point necessitated trade-offs between maintaining adequate boiling pressure while achieving acceptable cooling of the EGR and superheating of the water. The expander used in the system had a geometric compression ratio of 21 together with a steam outlet timing that caused high re-compression. Inlet pressures of up to 30 bar were therefore required for a stable expander power output. Such high pressures increased the pump power, and reduced the EGR cooling in the boiler because of pinch-point effects. Simulations indicated that reducing the expander's compression ratio from 21 to 13 would allow 30% lower steam supply pressures without adversely affecting the expander's power output.

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“…Relevant values for mechanical efficiency and friction mean effective pressure (FMEP) recorded at BHE have therefore been used to develop a representative engine friction model with varying speed. This is based upon the wellestablished friction correlation developed by Chen and Flynn [26] and reproduced for reference in equation (2): -…”

Section: Model Theorymentioning

confidence: 99%

Investigation into a stepped-piston engine solution for automotive range-extender vehicles and hybrid electric vehicles to meet future green transportation objectives

Hooper

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Securing the objectives for future high efficiency low CO2 vehicles is a key target for automotive manufacturers. This paper considers a high durability two-stroke cycle engine in terms of performance and computational modelling of emission characteristics for automotive range-extender or hybrid electric vehicle power plant application. The engine uses novel segregated pump charging via the application of stepped pistons and the study compares the engine characteristics with a comparable four stroke cycle engine of similar expected power output (60+ kW per litre). In the interests of cost minimisation both engines are limited to parallel two cylinder in-line configurations with the intention of still being able to achieve acceptably low noise, vibration and harshness (NVH) characteristics. In order to achieve low engine exhaust emissions computational modelling of direct injection is considered for the stepped piston engine. Significant NOx emission reduction of between 31% and 55% is observed.

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Development of a Single Cylinder Compression Ignition Research Engine

Cited by 235 publications

References 4 publications

Optimization of 2‑Stage Turbocharged Gas SI Engine Under Steady State Operation

Optimization of 2‑Stage Turbocharged Gas SI Engine Under Steady State Operation

Performance Analysis of a Reciprocating Piston Expander and a Plate Type Exhaust Gas Recirculation Boiler in a Water-Based Rankine Cycle for Heat Recovery from a Heavy Duty Diesel Engine

Investigation into a stepped-piston engine solution for automotive range-extender vehicles and hybrid electric vehicles to meet future green transportation objectives

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