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<p>The paper presents experimental data on velocity fields of a steady flow in the cylinder as it is filled with air through a poppet valve and channels in a cylinder head (CH) with cylinders of various cross section shapes (a circle, a square, and a triangle). The investigations were carried out on a laboratory stand simulating the main elements of the intake system of a reciprocating engine. A steady-state motion in the gas-dynamic system was created using a compressor settling the air from the cylinder. The average air flow velocity in the intake manifold was from 2 to 5 m/s. The investigations into the structure of the flow in the cylinder were carried out using a 2D PIV system. It has been established that the shape of the CH channel cross section has a substantial effect in the air flow distribution in the reciprocating engine cylinder. It is shown that in using a round cannel, there is a flow motion in CH along the side walls and there is virtually no flow in the center of the cylinder. The use of a square channel results in a more uniform filling of the entire cylinder volume with air. The installation of a CH with a triangular channel leads to the formation of a large-scale flow swirl inside the cylinder. The obtained data create a scientific foundation for designing intake systems with improved gas exchange quality indicators and promising characteristics of reciprocating engines.</p>

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Gas-Dynamic Features of Stationary Air Flow Admission into a Cylinder Through a Poppet Valve and Cross Profiled Channels

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • L. V. Plotnikov,
  • D. A. Davydov,
  • D. N. Krasil’nikov,
  • V. A. Shurupov

摘要

The paper presents experimental data on velocity fields of a steady flow in the cylinder as it is filled with air through a poppet valve and channels in a cylinder head (CH) with cylinders of various cross section shapes (a circle, a square, and a triangle). The investigations were carried out on a laboratory stand simulating the main elements of the intake system of a reciprocating engine. A steady-state motion in the gas-dynamic system was created using a compressor settling the air from the cylinder. The average air flow velocity in the intake manifold was from 2 to 5 m/s. The investigations into the structure of the flow in the cylinder were carried out using a 2D PIV system. It has been established that the shape of the CH channel cross section has a substantial effect in the air flow distribution in the reciprocating engine cylinder. It is shown that in using a round cannel, there is a flow motion in CH along the side walls and there is virtually no flow in the center of the cylinder. The use of a square channel results in a more uniform filling of the entire cylinder volume with air. The installation of a CH with a triangular channel leads to the formation of a large-scale flow swirl inside the cylinder. The obtained data create a scientific foundation for designing intake systems with improved gas exchange quality indicators and promising characteristics of reciprocating engines.