Losses effect on the performance of a Gamma type Stirling engine

Li, Ruijie; Grosu, Lavinia; Queiros-Condé, Diogo

doi:10.1016/j.enconman.2016.02.007

Cited by 58 publications

(21 citation statements)

References 27 publications

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“…Limited number of researchers [39][40][41][42] took this type of loss into consideration. They used a simple formula to calculate this pressure loss and combined it with the total pressure drop produced within the heat exchangers.…”

Section: Power Loss Due To Piston Finite Speedmentioning

confidence: 99%

Energy and Exergy Analyses of Stirling Engine using CFD Approach

Ghafour

Mikhael

Ghandour

2020

ARFMTS

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A comprehensive characterization of the GPU-3 Stirling engine losses with the aid of the CFD approach is presented. Firstly, a detailed description of the losses-related phenomena along with the method of calculating each type of loss are addressed. Secondly, an energy analysis of the engine is carried out in order to specify the impact of each type of losses on the performance. Finally, the design effectivity of each component of the engine is investigated using an exergy analysis. The results reveal that the hysteresis loss occurs mainly within the working spaces due to the flow jetting during the first part of the expansion strokes. Additionally, the pressure difference between the working spaces is the main driver for the flow leakage through the appendix gap. The exposure of the displacer top wall to the jet of hot gas flowing into the expansion space during expansion stroke essentially increases the shuttle heat loss. A new definition for the regenerator effectiveness is presented to assess the quality of the heat storage and recovery processes. The energy analysis shows that regenerator thermal loss and pumping power represent the largest part of the engine losses by about 9.2% and 7.5% of the heat input, respectively. The exergy losses within regenerator and cold space are the highest values among the components, consequently, they need to be redesigned.

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Section: Power Loss Due To Piston Finite Speedmentioning

confidence: 99%

Energy and Exergy Analyses of Stirling Engine using CFD Approach

Ghafour

Mikhael

Ghandour

2020

ARFMTS

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“…The Franchot engine enjoys small enthalpy loss as the leaks shuttle between similar temperature chambers. The enthalpy is calculated as [39] ̇= }̇D 26 where depends on the mass leakage direction between opposite expansion or compression spaces. It is the source temperature for positive mass flow rate and working space temperature for negative mass flow rate.…”

Section: Balanced Compounding Of the Cylinder Heated/cooled Franchot mentioning

confidence: 99%

A novel Franchot engine design based on the balanced compounding method

Daoud

Friedrich

2018

Energy Conversion and Management

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The Franchot engine is a double acting Stirling engine with only two cylinders and freely controllable phase angle. The hot and cold cylinders of the Franchot engine can be directly heated and cooled and thus act as heaters/coolers. However, the cylinders are necessarily long and thin to increase the heat transfer area and hence the power. The long strokes result in long cranks and connecting rods which lead to large and unwieldy engines. In this contribution, the directly heated and cooled multi-cylinder Franchot engine is dynamically studied with a novel balanced compounding mechanism. Thus, the balanced compound Franchot engine would be more compact, cheaper and more efficient due to the removal of the rotational parts. The new mechanism includes a linkage between two connecting rods in a conventional Franchot engine for which, four pistons (an expansion, compression and two guiding pistons) move as one reciprocator. The influence of different engine parameters, such as number of cylinders, temperature, dead volume and reciprocator mass, on the new configuration is investigated. The possible phase angles for each number of cylinders are given. The balanced compound Franchot engine changes the order of piston motion so that the largest of these phase angles is obtained. The theoretical analysis shows that increasing the number of cylinders, dead volume and reciprocating mass reduces the frequency and increases the stroke; increasing the cylinder diameter increases the frequency and decreases the stroke; increasing the load decreases the stroke and slightly decreases the frequency; and increasing the temperature increases both the frequency and the stroke. Thus, different engine parameters can be used to maximise the power generation without the piston hitting the cylinder head. The dynamic load, which is a function of the speed, does not prevent the balanced compound Franchot engine from self-starting while static friction can prevent the engine from self-starting, especially if the pistons are around the mid-stroke point. The most promising configuration is the three-phase engine which has the lowest number of cylinders, preferable phase angle and phase shift of 120 o and potential for electricity generation and heat pumping.

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“…Simulation work enables detailed study of Stirling engine design parameters [5]. It is used for the task of optimization [6 -13], exploration of new design or concept [14 -19] as well as parametric study of Stirling engines [5,20,21]. Experimental study focuses on validation and performance testing of existing or new Stirling engine design [9,16].…”

Section: Introductionmentioning

confidence: 99%

Experimental comparison of sinusoidal motion and non-sinusoidal motion of rise-dwell-fall-dwell in a Stirling engine

Wong¹,

Goh²

2020

JMES

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The Stirling engine is deemed to play a role in the near future of power generation. However, there is a large performance difference between the real and ideal Stirling engine. The use of sinusoidal motion for both displacer and piston in current applications is one of the reasons for this difference as it limits heat transfer. This paper investigated the use of non-sinusoidal rise-dwell-fall-dwell (RDFD) motion on both displacer and piston to improve the performance of a real Stirling engine and compared it to the conventional sinusoidal motion crankshaft driven Stirling engine. A gamma configuration Stirling engine test rig with a data acquisition system was constructed for this investigation. Among the four flywheels with each specifically designed cam profile tested, one was with sinusoidal motion while the remaining three were non-sinusoidal for comparison. The use of non-sinusoidal RDFD cam with 135° displacer dwell improved more than 36% thermal efficiency over sinusoidal motion crankshaft Stirling engine.

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Losses effect on the performance of a Gamma type Stirling engine

Cited by 58 publications

References 27 publications

Energy and Exergy Analyses of Stirling Engine using CFD Approach

Energy and Exergy Analyses of Stirling Engine using CFD Approach

A novel Franchot engine design based on the balanced compounding method

Experimental comparison of sinusoidal motion and non-sinusoidal motion of rise-dwell-fall-dwell in a Stirling engine

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