Improvement of One-Dimensional Analytical Model of Rotating Long Orifice with Chamfered or Radiused Inlet

In this paper, computational fluid dynamics calculations were conducted under various kinds of complex working conditions for rotating long orifice. As one of the most important structures of throttling and pressure limiting, orifice plays a significant role in flow control of the whole system. The existing empirical correlation was improved by correction on characteristics of low Reynolds number and compressibility. Then, improved one-dimensional analytical model of rotating long orifice with chamfered or radiused inlet was developed by programming. The model was verified against the results of commercial computational fluid dynamics codes. It turns out that the model has high precision, excellent convergence, and can predict the flow parameters under working conditions of low Reynolds number, supersonic and high pressure ratio with an acceptable error. And only geometric features, rotational speed and boundary conditions are required for one-dimensional modeling. Thus, it can be applied in the one-dimensional calculation and design of secondary air system widely.

[1]  Sigmar Wittig,et al.  Discharge Coefficients of Rotating Short Orifices With Radiused and Chamfered Inlets , 2004 .

[2]  Sigmar Wittig,et al.  Discharge Coefficients of a Preswirl System in Secondary Air Systems , 2002 .

[3]  Marcus Hüning.  Comparison of Discharge Coefficient Measurements and Correlations for Orifices With Cross-Flow and Rotation , 2010 .

[4]  Wu Hao.  Characteristics of vertical sharp-edged orifice discharge (II) Behavior of fluid in contributing flow region in front of orifice , 2008 .

[5]  Reinhard Niehuis,et al.  Experimental Study of Discharge Coefficients for Radial Orifices in High-Speed Rotating Shafts , 2010 .

[6]  A. K. Singhal,et al.  Mathematical Basis and Validation of the Full Cavitation Model , 2002 .

[7]  William F. McGreehan,et al.  Flow Characteristics of Long Orifices With Rotation and Corner Radiusing , 1987 .

[8]  N. S. Lakshmana Rao,et al.  Loss Characteristics of Orifices and Nozzles , 1978 .

[9]  A. Alexiou,et al.  Secondary Air System Component Modeling for Engine Performance Simulations , 2009 .

[10]  G. Williams,et al.  Internal flow systems , 1980 .

[11]  LI Zhong-zhou.  Experiment of discharge coefficients for small scale cylindrical holes , 2010 .

[12]  Adrian Spencer,et al.  Discharge Coefficients of Cooling Holes With Radiused and Chamfered Inlets , 1991 .

[13]  Donald M. Parker,et al.  An enhanced method to compute the compressible discharge coefficient of thin and long orifices with inlet corner radiusing , 1991 .

[14]  K. R. Pullen,et al.  Correlations for the discharge coefficient of rotating orifices based on the incidence angle , 2005 .

[15]  Chaoyu Yan,et al.  A criterion for flow mechanisms through vertical sharp-edged orifice and model for the orifice discharge coefficient , 2011 .

[16]  Wu Hao,et al.  Characteristics of vertical sharp-edged orifice discharge(I) Effect of flow regime and configuration parameters on orifice discharge coefficient , 2008 .

[17]  E. Markland,et al.  Discharge Coefficients for Incompressible Non-Cavitating Flow through Long Orifices , 1965 .

[18]  Liu Yansheng.  Characteristics of vertical sharp-edged orifice discharge(III) Effect of geometry on orifice discharge coefficient , 2009 .

[19]  Andrew J. Shine,et al.  Experimental Study of Flow Through Moving Orifices , 1965 .

[20]  Keith Robert Pullen,et al.  The Influence of Incidence Angle on the Discharge Coefficient for Rotating Radial Orifices , 2004 .

[21]  A. Alexiou,et al.  Secondary Air System Component Modelling for Engine Performance Simulations , 2008 .