CompressedAirSystemAPI

AirStroageTank(; name, V, T, p0)

Air tank.

Valve with constant resistance.

Arguments:

• V: [m³] Volume, defaults: 20
• T: [K] Temperature, defaults: 300
• p0: [Pa] Initial pressure, defaults: 1e5

Connectors:

• inlet inlet of components
• outlet outlet of components

ConstantValve(; name, R)

Valve with constant resistance.

Connectors:

• inlet inlet of components
• outlet outlet of components

FlowPort(; name)

Port(inlet or outlet) in CompressedAirSystem.

States:

• p(t): [Pa] The pressure at this port
• qm(t): [kg/s] The mass flow rate passing through this port
• T(t): [K] The mass flow rate passing through this port
• ρ(t): [kg/m³] The density passing at this port
• μ(t): [Pa⋅s] The absolute viscosity at this port
• qv(t): [m³/s] The volume flow rate passing through this port

Purifier(; name, c, Δp, T)

General purifier.

Arguments:

• c: Purification coefficient, percentage of residual mass flow after purification to inlet mass flow, defaults: 1.0
• Δp: [Pa] Absolute pressure drop across the component
• T: [K] Outlet temperature after cooling

Connectors:

• inlet inlet of components
• outlet outlet of components

SISOComponent(; name)

The Component with two ports inlet and outlet and mass flow qm flows from inlet to outlet. It plays the same role as Oneport in the circuit system.

States:

• qm(t): [kg/s] The mass flow rate passing through this component
• Δp(t): [Pa] The pressure difference at a component
• ρ_mean(t): [kg/m³] The density at a component
• μ_mean(t): [Pa⋅s] The absolute viscosity at a component
• qv_mean(t): [m³/s] The volume flow rate passing through this component

Connectors:

• inlet inlet of components
• outlet outlet of components

SimplifiedPipe(; name, R0)

Simplified pipe model

Arguments:

• R0: [kg/m^7] Resistance coefficient of pipeline

Connectors:

• inlet inlet of components
• outlet outlet of components

Source(; name, boundary)

Source is a general source, which can generate pressure boundary("p"), temperature boundary("T") or mass flow boundary("qm") with different input parameters.

Valve with constant resistance.

Arguments:

• boundary: Dict with boundaries

Connectors:

• source: port of source

inletBoundary = Dict(
    "p" => 1.0e5(1 + 0.001sin(t)),
    "T" => 300,
)

StraightPipe(; name, D, L, ϵ)

Straight round pipe and height difference is not considered. Friction coefficient is obtained from Modi diagram.

Arguments:

• D: [m] Pipe diameter, defaults: 1.0
• L: [m] Pipe length, defaults: 1.0
• ϵ: [m] Absolute roughness of pipeline, defaults: 0.05

Connectors:

• inlet inlet of components
• outlet outlet of components

TransitionPipe(; name, n, f, D, L, T, p0, qm0)

Simplified pipe model

Arguments:

• f: [kg/m⁷] Resistance coefficient of pipeline
• n: Number of pipe discrete node
• D: [m] Pipe diameter, defaults: 1.0
• L: [m] Pipe length, defaults: 1.0
• T: [K] Ambient temperature, defaults: 300
• p0: [Pa] Initial pressure of each node
• qm0: [kg/(m²⋅s)] Initial specific momentum of each node

Connectors:

• inlet inlet of components
• outlet outlet of components

VarySpeedCompressor(
;
    name,
    n0,
    h_polCoff,
    etaCoff,
    surgeCoff,
    chokeCoff
)

Variable speed compressor.

\[h_polCoff = a1 * inlet.qv^2 + a2 * inlet.qv * n / n0 + a3 * (n / n0)^3) * g\]

\[etaCoff = b1 * inlet.qv^2 * (n0 / n)^2 + b2 * inlet.qv * n0 / n + b3\]

\[surgeCoff = (c1 * n * n + c2 * n + c3) / 3600\]

\[chokeCoff = (d1 * n * n + d2 * n + d3) / 3600\]

States:

• qm(t): [kg/s] The mass flow rate
• n(t): [rpm] speed
• ϵ(t): pressure ratio
• h_pol(t): [J] Energy head
• h_tot(t): [J] Total Work
• eta_pol(t): Surge limit coefficient
• qv_surge(t): [kg/s] Surge flow rate
• qv_choke(t): [kg/s] choke flow rate
• σ(t)

Arguments:

• n0: [rpm] Rated speed
• h_polCoff: Work coefficient
• etaCoff: Efficiency coefficient
• surgeCoff: Surge limit coefficient
• chokeCoff: Choke limit coefficient

Connectors:

• inlet inlet of components
• outlet outlet of components

pipeFriction_turbulent(f, Re, ϵ, D) -> Any

Fitting Formula for Friction Coefficient of Turbulent Pipe

pipeRe(ρ, u, D, μ) -> Any

Reynolds number

pipeVelocity(Δp, ρ, L, D, f) -> Any

Flow rate in pipe

stateEquation(p, ρ, T) -> Any

State Equation of Dry Air