Sage Simulation Model for Technology Demonstration Convertor by a Step-by-Step Approach

Demko, Rikako; Penswick, L. Barry

doi:10.2514/6.2005-5538

Cited by 9 publications

(11 citation statements)

References 8 publications

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“…No correction was necessary to account for compressibility or oscillating flow in modeling the SOLO 161. On the other hand, the modeling of the TDC [5] implies that a correction for compressibility is needed at 2.5 MPa and 81 Hz engine speed. This suggests a rule of thumb that for engines operating below a mean pressure of 3.0 MPa and at engine speeds above 1500 rpm, the effects of unsteady, compressible flow need accounting for.…”

Section: Complete Engine Evaluationmentioning

confidence: 99%

“…Demko and Penswick [5] modeled the NASA Technology Demonstration Convertor (TDC) Stirling engine using Sage. The TDC is a small free-piston engine.…”

Section: Introductionmentioning

confidence: 99%

“…The engine modeled was the same NASA TDC as for [5]. The complete compressible momentum equation including the VðV$ũÞ term can be properly calculated in this type of model.…”

Section: Introductionmentioning

confidence: 99%

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Modeling a complete Stirling engine

Paul

Engeda

2015

Energy

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a b s t r a c tThe assumptions of second order Stirling engine models were reviewed. An ideal adiabatic plus simple heat exchanger model was developed. The model included the external components such as the fan, combustor, and preheater. The external heat transfer to the engine heater was modeled using a logmean-temperature difference for a constant tube surface temperature. The performance of the model of the external components compared reasonably well to experimental data. The performance of the complete engine model was also compared to experimental data of the GPU-3. By adjusting the flow dissipation to better account for unsteady flow conditions and compressibility effects, the complete engine model was able to predict engine power and brake specific fuel consumption to within ±14% over a wide range of engine speeds and mean pressures. This analysis and others suggest that second order models of Stirling engines need to account for the gradient of the divergence of velocity term in the compressible momentum equation if the mean engine pressure is low enough (less than 3.0 MPa) and the engine speed is high enough (above 30 Hz).

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Section: Complete Engine Evaluationmentioning

confidence: 99%

“…Demko and Penswick [5] modeled the NASA Technology Demonstration Convertor (TDC) Stirling engine using Sage. The TDC is a small free-piston engine.…”

Section: Introductionmentioning

confidence: 99%

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Modeling a complete Stirling engine

Paul

Engeda

2015

Energy

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“…The 3 rd order model that is used in this work is the commercial Stirling engine software Sage created by Gedeon [8]. This has been used for modelling various engines [9] including low-temperature Stirling engines [10], and is able to provide trends of engine power, gas temperatures, and pressure swing for varying heat exchanger geometry.…”

Section: A Model Type Selectionmentioning

confidence: 99%

Investigations Into The Effect Of Heat Exchanger Volume And Geometry On Low-Temperature Stirling Engine Performance

Hasanovich¹,

Nobes²

2021

Progress in Canadian Mechanical Engineering. Volume 4

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The Stirling engine is capable of converting any source of thermal energy into kinetic energy, provided there is a temperature difference between the heat source and sink. This makes it an attractive option for utilizing low-temperature sources such as geothermal or waste heat. However, at these low temperatures, below 100 °C, the optimal engine geometry for a Stirling engine is not well known. It is important to be able to select the optimal geometry of key components, such as the heat exchanger, in order to minimize losses that could further reduce the engine efficiency at low-temperatures. To better understand what the optimal geometry of the heat exchanger components is, a Stirling engine is modelled using third-order commercial modelling software (Sage) and trends of engine properties such as power, temperature, and pressure for different heat exchanger geometries are observed. These trends provide insight into the optimal geometry of these components for low-temperature Stirling engines, as well as providing a methodology for evaluating optimal engine geometry for future engines to be built.

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“…28,29 Examples of the use of Sage and the good quality of the predictions made can be found, for example, in refs. 30,31 Figure 2 shows the set-up of the main model at the top, the spatial discretisation of the individual components in the middle (each component is composed of a number (N C ) of identical elements), and the corresponding sub-models for each component at the bottom. The model includes all the physical elements of a real engine.…”

Section: The Sage Third-order Simulation Modelmentioning

confidence: 99%

Thermodynamic peculiarities of alpha-type Stirling engines for low-temperature difference power generation: Optimisation of operating parameters and heat exchangers using a third-order model

Hoegel

Pons

Gschwendtner³

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part C:

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Low-temperature heat sources such as waste heat and geothermal energy in the range from 100 ℃ to 200 ℃ are widely available and their potential is largely untapped. Stirling engines are one possibility to convert this heat to a usable power output. Much work has been done to optimise Stirling engines for high-temperature heat sources such as external combustion or concentrated solar energy but only little is known about suitable engine layouts at lower temperature differences. With the reduced temperature difference, changes become necessary not only in the heat exchangers and the regenerator but also in the operating parameters such as frequency and phase angle. This paper shows results obtained from a third-order simulation model that help to identify beneficial parameter combinations, and explains the differences of low and high-temperature engines.

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Sage Simulation Model for Technology Demonstration Convertor by a Step-by-Step Approach

Abstract: The development of a Stirling model using the 1-D Sage design code was completed using a step-by-step approach. This is a method of gradually increasing the complexity of the Sage model while observing the energy balance and energy losses at each step of the development.

Cited by 9 publications

References 8 publications

Modeling a complete Stirling engine

Modeling a complete Stirling engine

Investigations Into The Effect Of Heat Exchanger Volume And Geometry On Low-Temperature Stirling Engine Performance

Thermodynamic peculiarities of alpha-type Stirling engines for low-temperature difference power generation: Optimisation of operating parameters and heat exchangers using a third-order model

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