What Mach Number Means

适用场景

Use this guide when teams argue about whether incompressible assumptions are still valid at your velocities.

要使用的工具

Browser-based preliminary check for Mach Number Calculator — fast estimates, not code or stamped design output.

打开 Mach Number Calculator →

步骤

  1. 1Compute local speed of sound from temperature and gas properties for your fluid.
  2. 2Divide flow speed by sound speed to get Mach number.
  3. 3Classify subsonic, transonic, and supersonic regimes for method selection.
  4. 4Revisit ideal gas assumptions when pressures or temperatures swing widely.
  5. 5Escalate to full compressible CFD when shocks and separation dominate.

示例

  • HVAC duct velocities vs compressibility (often negligible).
  • Nozzle screening in propulsion coursework.

应避免

  • Using sea-level sound speed at hot exhaust conditions.
  • Confusing mass-averaged vs area-averaged velocities in ducts.
  • Applying incompressible Bernoulli where Mach exceeds roughly 0.3 without checks.

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工程 中的更多内容

所有任务指南 或前往 工程 专区.

常见问题

Humid air?

Humidity changes properties slightly; document whether you use dry-air approximations.

Liquid Mach?

Liquids have a sound speed too, but applications differ; context matters.

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