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Intake Ramp Analysis

This module provides functions for analyzing multi-ramp external-compression intakes. Each ramp is treated as an oblique shock and the downstream Mach number and property ratios are computed sequentially.

Overview

A typical supersonic inlet uses one or more compression ramps to slow and compress the incoming flow. For an incoming Mach number $M_\infty$ and a list of ramp deflection angles $\theta_i$, the intake is modeled by applying the oblique-shock relations at each ramp. The function intake_ramp returns the Mach number after each shock along with density, pressure, and total-pressure ratios.

Functions

CompAir.intake_ramp — Function
intake_ramp(M_infty::Real, ramp_angle::Vector{<:Real}, gamma::Real=1.4)

주어진 램프 각도(rampangle) 배열과 자유류 마하수(Minfty), 비열비(gamma)에 대해 다단 램프 흡입구의 각 단에서의 마하수, 밀도비, 압력비, 전체압비, 충격파 각도를 계산한다.

Arguments

  • M_infty::Real: 자유류(입구) 마하수
  • ramp_angle::Vector{<:Real}: 각 램프의 각도 (degree)
  • gamma::Float64: 비열비(기본값 1.4)

Returns

  • NamedTuple:
    • M: 각 단의 마하수 벡터 (길이 n+1)
    • rho2_ratio: 각 단의 밀도비 벡터 (길이 n)
    • p2_ratio: 각 단의 압력비 벡터 (길이 n)
    • p0_ratio: 각 단의 전체압비 벡터 (길이 n)
    • beta: 각 단의 충격파 각도 벡터 (길이 n)
source

Function Details

intake_ramp

intake_ramp(M_infty, ramp_angle, gamma=1.4)

Compute the flow properties across a series of intake ramps.

Arguments:

  • M_infty::Real: Freestream Mach number
  • ramp_angle::Vector{<:Real}: Ramp deflection angles in degrees
  • gamma::Real=1.4: Specific heat ratio

Returns:

  • NamedTuple containing:
    • M: Vector of Mach numbers at each stage (length n+1)
    • rho2_ratio: Density ratios across each shock (length n)
    • p2_ratio: Pressure ratios across each shock (length n)
    • p0_ratio: Total-pressure ratios across each shock (length n)
    • beta: Shock angles in degrees (length n)

Algorithm:

  1. Initialize the Mach number array with M_infty.
  2. For each ramp angle, call solve_oblique to obtain the downstream Mach number and property ratios.
  3. Collect the results into vectors and return them as a NamedTuple.

Example:

julia> sol = intake_ramp(2.5, [10, 16])
(M = [2.5, 2.085, ...], rho2_ratio = [...], p2_ratio = [...], p0_ratio = [...], beta = [...])

See Also

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