Compressor Flow Extrapolation and Library Design for the Modelica Vehicle Propulsion Library - VehProLib

Eriksson, Lars; Nezhadali, Vaheed; Andersson, Conny

doi:10.4271/2016-01-1037

Cited by 5 publications

(5 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where T ref and p ref are the reference temperature and pressure, respectively, T in and p in are the temperature and pressure at the compressor inlet, respectively. The derivation of Equations (1) and (2) is based on the dimensional analysis of the compression process in a compressor [14]. For a compressor, its whole operating area is normally divided into three zones, as shown in Figure 1, i.e., design operating zone, surging zone, and choking zone.…”

Section: Compressor Performance Mapmentioning

confidence: 99%

“…Polynomial functions, as shown in Equations (13) and (14) are used to describe the changing trend of flow coefficient and pressure ratio with compressor rotational speed at the surging line:…”

Section: The Kolmanovsky Modelmentioning

confidence: 99%

“…For the area to the right side of the curve represented by Equations (13) and (14), the relationship between φ and Π can be described with the exponential function as follows:…”

Section: Of 32mentioning

confidence: 99%

See 2 more Smart Citations

Applicable and Comparative Research of Compressor Mass Flow Rate and Isentropic Efficiency Empirical Models to Marine Large-Scale Compressor

Shen

Zhang

et al. 2019

Energies

View full text Add to dashboard Cite

A compressor is an indispensable component of marine large two-stroke diesel engines. For this type of engine, the compressor mass flow rate and isentropic efficiency empirical models are preferred for both the working cycle dynamic simulation research and the design and testing of control and diagnostics algorithms due to their compact and simple structures, and satisfactory prediction accuracy. Due to absence of comprehensive applicable and comparative research on compressor mass flow rate and isentropic efficiency empirical models for large-scale marine compressors in the literature, two marine compressors with different size, flow rate range, and speed range were selected as research objects in this paper, and a relevant study was conducted to compare and analyze the prediction ability of several classical models, and some recently proposed compressor mass flow rate and isentropic efficiency empirical models. The range of this comparative study includes the prediction accuracy in the design operating area and the extrapolation ability in off-design operating areas. Based on the obtained research results, several guidelines are summarized, which can be followed when developing compressor mathematical models, especially for marine applications. In addition, several research interests are discussed and presented, which can be further studied in the future.

show abstract

Section: Compressor Performance Mapmentioning

confidence: 99%

Section: The Kolmanovsky Modelmentioning

confidence: 99%

See 1 more Smart Citation

Applicable and Comparative Research of Compressor Mass Flow Rate and Isentropic Efficiency Empirical Models to Marine Large-Scale Compressor

Shen

Zhang

et al. 2019

Energies

View full text Add to dashboard Cite

show abstract

“…This can happen during the initial convergence phase, due to a low load engine operation or even in a transient evolution. 13,14 It is important for a proper calculation to be able to have information in extreme off-design conditions, avoiding discontinuities that could lead to errors. This work is addressed to provide a model that allows extending a common compressor map range to assure the accuracy and convergence of the engine cycle simulation.…”

Section: Introductionmentioning

confidence: 99%

A zonal approach for estimating pressure ratio at compressor extreme off-design conditions

Galindo

Garcia

García-Cuevas

et al. 2018

International Journal of Engine Research

View full text Add to dashboard Cite

Zero-dimensional/one-dimensional computational fluid dynamics codes are used to simulate the performance of complete internal combustion engines. In such codes, the operation of a turbocharger compressor is usually addressed employing its performance map. However, simulation of engine transients may drive the compressor to work at operating conditions outside the region provided by the manufacturer map. Therefore, a method is required to extrapolate the performance map to extended off-design conditions. This work examines several extrapolating methods at the different off-design regions, namely, low-pressure ratio zone, low-speed zone and high-speed zone. The accuracy of the methods is assessed with the aid of compressor extreme off-design measurements. In this way, the best method is selected for each region and the manufacturer map is used in design conditions, resulting in a zonal extrapolating approach aiming to preserve accuracy. The transitions between extrapolated zones are corrected, avoiding discontinuities and instabilities.

show abstract

“…However, if the data is not smooth, this step could be done with an appropriate curve fit. Polynomials have shown poor performance in previous works, but an ellipse fit to the speed lines showed good accuracy [15,16] and could be employed. The spline along (henceforward referred to as the v line) was initially tested with a linear spline.…”

Section: Mapping Algorithmmentioning

confidence: 99%

A Flow and Loading Coefficient-Based Compressor Map Interpolation Technique for Improved Accuracy of Turbocharged Engine Simulations

Gharaibeh

Costall

2017

SAE Technical Paper Series

View full text Add to dashboard Cite

Internal combustion engines are routinely developed using 1D engine simulation tools. A well-known limitation is the accuracy of the turbocharger compressor and turbine sub-models, which rely on hot gas bench-measured maps to characterize performance. Such discrete map data is inherently too sparse to be used directly in simulation, and so a preprocessing algorithm interpolates and extrapolates the data to generate a wider, more densely populated map. Methods used for compressor map interpolation vary. They may be mathematical or physical in nature, but there is no unified approach, except that they typically operate on input map data in SAE format. For decades it has been common practice for turbocharger suppliers to share performance data with engine OEMs in this form. This paper describes a compressor map interpolation technique based on the nondimensional compressor flow and loading coefficients, instead of SAE-format data. It compares the difference in compressor operating point prediction accuracy when using this method against the standard approach employing dimensional parameters. This is done by removing a speed line from a dataset, interpolating for the removed speed using the two methods, and comparing their accuracy to the original data. Three maps corresponding to compressor diameters of 54, 88, and 108 mm were evaluated. In some cases, the residual sum of squares between the interpolated and original data demonstrated an order of magnitude improvement when using the nondimensional coefficients. When evaluated in a simple engine model, this manifests as a slight shift in interpolated turbocharger speed, resulting in a difference in predicted compressor efficiency of up to 0.89 percentage points. This paper shows how the use of truly nondimensional interpolation techniques can improve the accuracy of processed turbocharger compressor maps, and consequently the value of 1D engine simulations as a reliable performance development tool, at virtually no additional effort or cost.

show abstract

Compressor Flow Extrapolation and Library Design for the Modelica Vehicle Propulsion Library - VehProLib

Cited by 5 publications

References 24 publications

Applicable and Comparative Research of Compressor Mass Flow Rate and Isentropic Efficiency Empirical Models to Marine Large-Scale Compressor

Applicable and Comparative Research of Compressor Mass Flow Rate and Isentropic Efficiency Empirical Models to Marine Large-Scale Compressor

A zonal approach for estimating pressure ratio at compressor extreme off-design conditions

A Flow and Loading Coefficient-Based Compressor Map Interpolation Technique for Improved Accuracy of Turbocharged Engine Simulations

Contact Info

Product

Resources

About