Class FluidMachinery

java.lang.Object

org.episteme.natural.engineering.fluids.FluidMachinery

public class FluidMachinery
extends Object

Fluid machinery calculations. Modernized to use high-precision Real and typed Quantities.

Since:

1.0

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Field Summary

Fields

Modifier and Type	Field	Description
static final Quantity<MassDensity>	RHO_WATER	Water density (kg/m³)

Method Summary

Modifier and Type	Method	Description
static Quantity<VolumetricFlowRate>	affinityFlowRate(Quantity<VolumetricFlowRate> Q1, Quantity<Frequency> N1, Quantity<Frequency> N2)	Affinity laws: flow rate vs speed.
static Quantity<Length>	affinityHead(Quantity<Length> H1, Quantity<Frequency> N1, Quantity<Frequency> N2)	Affinity laws: head vs speed.
static Quantity<Power>	affinityPower(Quantity<Power> P1, Quantity<Frequency> N1, Quantity<Frequency> N2)	Affinity laws: power vs speed.
static Real	cavitationNumber(Quantity<Pressure> pressure, Quantity<Pressure> vaporPressure, Quantity<MassDensity> density, Quantity<Velocity> velocity)	Cavitation number.
static Quantity<Power>	hydraulicPower(Quantity<MassDensity> density, Quantity<VolumetricFlowRate> flowRate, Quantity<Length> head)	Pump hydraulic power.
static Quantity<Length>	npshAvailable(Quantity<Pressure> atmosphericPressure, Quantity<Length> suctionHeight, Quantity<Length> frictionLoss, Quantity<Pressure> vaporPressure, Quantity<MassDensity> density)	Net Positive Suction Head available.
static Quantity<Velocity>	peltonJetVelocity(Quantity<Length> head, Real velocityCoefficient)	Pelton wheel jet velocity. v = Cv * sqrt(2 * g * H)
static Real	pumpEfficiency(Quantity<Power> hydraulicPower, Quantity<Power> shaftPower)	Pump efficiency.
static Real	specificSpeed(Quantity<Frequency> speed, Quantity<VolumetricFlowRate> flowRate, Quantity<Length> head)	Specific speed (dimensionless-ish).
static Quantity<Power>	turbinePower(Real efficiency, Quantity<MassDensity> density, Quantity<VolumetricFlowRate> flowRate, Quantity<Length> head)	Turbine power output.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

RHO_WATER

public static final Quantity<MassDensity> RHO_WATER

Water density (kg/m³)

Method Details

hydraulicPower

public static Quantity<Power> hydraulicPower(Quantity<MassDensity> density,
 Quantity<VolumetricFlowRate> flowRate,
 Quantity<Length> head)

Pump hydraulic power. P_h = ρ * g * Q * H

pumpEfficiency

public static Real pumpEfficiency(Quantity<Power> hydraulicPower,
 Quantity<Power> shaftPower)

Pump efficiency. η = P_hydraulic / P_shaft

affinityFlowRate

public static Quantity<VolumetricFlowRate> affinityFlowRate(Quantity<VolumetricFlowRate> Q1,
 Quantity<Frequency> N1,
 Quantity<Frequency> N2)

Affinity laws: flow rate vs speed. Q2 = Q1 * (N2 / N1)

affinityHead

public static Quantity<Length> affinityHead(Quantity<Length> H1,
 Quantity<Frequency> N1,
 Quantity<Frequency> N2)

Affinity laws: head vs speed. H2 = H1 * (N2 / N1)²

affinityPower

public static Quantity<Power> affinityPower(Quantity<Power> P1,
 Quantity<Frequency> N1,
 Quantity<Frequency> N2)

Affinity laws: power vs speed. P2 = P1 * (N2 / N1)³

npshAvailable

public static Quantity<Length> npshAvailable(Quantity<Pressure> atmosphericPressure,
 Quantity<Length> suctionHeight,
 Quantity<Length> frictionLoss,
 Quantity<Pressure> vaporPressure,
 Quantity<MassDensity> density)

Net Positive Suction Head available. NPSH_a = (P_atm / (ρg)) + H_s - H_f - (P_vap / (ρg))

cavitationNumber

public static Real cavitationNumber(Quantity<Pressure> pressure,
 Quantity<Pressure> vaporPressure,
 Quantity<MassDensity> density,
 Quantity<Velocity> velocity)

Cavitation number. σ = (P - P_vap) / (0.5 * ρ * v²)

specificSpeed

public static Real specificSpeed(Quantity<Frequency> speed,
 Quantity<VolumetricFlowRate> flowRate,
 Quantity<Length> head)

Specific speed (dimensionless-ish). Ns = N * sqrt(Q) / H^(3/4) Using RPM, m³/s, m often; here we keep it consistent with base units but return Real.

turbinePower

public static Quantity<Power> turbinePower(Real efficiency,
 Quantity<MassDensity> density,
 Quantity<VolumetricFlowRate> flowRate,
 Quantity<Length> head)

Turbine power output. P = η * ρ * g * Q * H

peltonJetVelocity

public static Quantity<Velocity> peltonJetVelocity(Quantity<Length> head,
 Real velocityCoefficient)

Pelton wheel jet velocity. v = Cv * sqrt(2 * g * H)