Modification of the Wiebe function for methane-air and oxy-methane- based spark-ignition engines

Alam, Shah Saud; Rosa, Scott Wilson; Depcik, Christopher; Burugupally, Sindhu Preetham; McDaniel, Ethan; Hobeck, Jared D.

doi:10.1016/j.fuel.2021.121218

Cited by 7 publications

(3 citation statements)

References 53 publications

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“…At 367.8 W, the engine will be spin at approximately 6891 rpm. It is important to note that Alam et al found oxy-methane combustion to be significantly more energetic in the absence of nitrogen to act as a diluent [13]. Thus, higher thermal efficiencies can be achieved, and this linear estimation would need to be revised after similar engine tests with methane and oxygen.…”

Section: Engine Power and Speedmentioning

confidence: 99%

“…While the Raven is normally propelled using an electric motor powered by lithium-ion batteries [11], the analysis presented assumes that the Ra ven would operate utilizing the Saito FG-11 internal combustion engine (ICE) [12], which is one of the smallest four-stroke model airplane engines on the market. Future efforts to predict fuel flow rates and flight time based on tank size will be accomplished using a simplified model for oxy-methane combustion [13] and an ICE model [9]. This study began by detailing the environmental conditions seen by the UAV on Mars.…”

Section: Introductionmentioning

confidence: 99%

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Martian Combustion-Powered Fixed-Wing UAVs: An Introductory Investigation and Analysis

et al. 2022

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The Martian topography needs to be investigated in greater detail for human habitations, and this can be accomplished faster using unmanned aerial vehicles (UAVs). In this regard, the RQ-11B Raven appears suitable for remote sensing and topography-mapping applications on Mars, due to its popularity in surveillance and reconnaissance applications on Earth. As a result, this study investigates the flight of this UAV in the Martian atmosphere with the assumptions that it employs an NACA S7012 airfoil and its electric propulsion technology is replaced with a four-stroke oxy-methane fueled Saito FG-11 internal combustion engine (ICE). This ICE is estimated to supply 367.8 W resulting in an engine speed of 6891 revolutions per minute. Based on this speed, the UAV must fly at least 72 m/s (Re = 18,100) at a 5° angle of attack to support flight under calm conditions. To achieve this speed will be difficult; thus, a weather balloon or German V1-style launch system should be employed to launch the UAV successfully. Furthermore, the UAV must operate below 165 m/s (Re = 41,450) to prevent transonic conditions. Finally, the vehicle’s fuel and oxidizer tanks can be refueled using an in situ methane and oxygen production system, enabling its sustainable use on Mars.

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Section: Engine Power and Speedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Martian Combustion-Powered Fixed-Wing UAVs: An Introductory Investigation and Analysis

et al. 2022

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“…The "two zones" combustion models [16][17][18] belong to the first category and mostly refer to SI engines: in these models, the mass inside the combustion chamber is divided into burnt and unburnt gases, and the development of the flame front is modeled by evaluating the laminar and turbulent burning speed; this kind of models, after a proper calibration with experimental data, can predict the combustion evolution, and hence the engine performances, in different operating conditions (engine speed, load, air/fuel ratio, etc.). An easier but less accurate way to simulate the combustion evolution is to model the MFB profile using a mathematical function; the most used for this purpose is the well-known Wiebe function [19,20] reported in Equation (1), which shows the typical sigmoidal trend of the experimental MFB profile as a function of crank angle. A double-Wiebe function can be used to simulate compression ignition engine combustion [21] and other kinds of combustions such as HCCI [21,22] (homogeneous charge compression ignition), dual-fuel combustion [21] (diesel-Natural Gas), or gasoline-ethanol fuel blend combustion [23].…”

Section: Introductionmentioning

confidence: 99%

A New Simple Function for Combustion and Cyclic Variation Modeling in Supercharged Spark Ignition Engines

Beccari

Pipitone

2022

Energies

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Research in the field of Internal Combustion (IC) engines focuses on the drastic reduction of both pollutant and greenhouse gas emissions. A promising alternative to gasoline and diesel fuel is represented by the use of gaseous fuels, above all green hydrogen but also Natural Gas (NG). In previous works, the authors investigated the performance, efficiency, and emissions of a supercharged Spark Ignition (SI) engine fueled with mixtures of gasoline and natural gas; a detailed research involving the combustion process of this kind of fuel mixture has been previously performed and a lot of experimental data have been collected. Combustion modeling is a fundamental tool in the design and optimization process of an IC engine. A simple way to simulate the combustion evolution is to implement a mathematical function that reproduces the mass fraction burned (MFB) profile; the most used for this purpose is the Wiebe function. In a previous work, the authors proposed an innovative mathematical model, the Hill function, that allowed a better interpolation of experimental MFB profiles when compared to the Wiebe function. In the research work presented here, both the traditional Wiebe and the innovative Hill function have been calibrated using experimental MFB profiles obtained from a supercharged SI engine fueled with mixtures of gasoline and natural gas in different proportions; the two calibrated functions have been implemented in a zero-dimensional (0-D) SI engine model and compared in terms of both Indicated Mean Effective Pressure (IMEP) and cyclic pressure variation prediction reliability. It was found that the Hill function allows a better IMEP prediction for all the operating conditions tested (several engine speeds, supercharging pressures, and fuel mixtures), with a maximum prediction error of 2.7% compared to 4.3% of the Wiebe function. A further analysis was also performed regarding the cyclic pressure variation that affects all the IC engines during combustion and may lead to irregular engine operation; in this case, the Hill function proved to better predict the cyclic pressure variation with respect to the Wiebe function.

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Exploring the application of oxy-fuel combustion to methanol spark ignition engines

Yue,

Wang,

Liu

et al. 2024

Applied Energy

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Modification of the Wiebe function for methane-air and oxy-methane- based spark-ignition engines

Cited by 7 publications

References 53 publications

Martian Combustion-Powered Fixed-Wing UAVs: An Introductory Investigation and Analysis

Martian Combustion-Powered Fixed-Wing UAVs: An Introductory Investigation and Analysis

A New Simple Function for Combustion and Cyclic Variation Modeling in Supercharged Spark Ignition Engines

Exploring the application of oxy-fuel combustion to methanol spark ignition engines

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