Rocket.hpp

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#pragma once
 
#include <janus/janus.hpp>
 
namespace vulcan::propulsion::rocket {

template <typename Scalar>
Scalar thrust_from_mdot(const Scalar &mdot, const Scalar &Ve) {
    return mdot * Ve;
}

template <typename Scalar>
Scalar exhaust_velocity(const Scalar &Isp, double g0 = 9.80665) {
    return Isp * g0;
}

template <typename Scalar>
Scalar specific_impulse(const Scalar &thrust, const Scalar &mdot,
                        double g0 = 9.80665) {
    return thrust / (mdot * g0);
}

template <typename Scalar>
Scalar delta_v(const Scalar &Ve, const Scalar &m0, const Scalar &mf) {
    return Ve * janus::log(m0 / mf);
}

template <typename Scalar>
Scalar propellant_mass(const Scalar &delta_v, const Scalar &m0,
                       const Scalar &Ve) {
    return m0 * (1.0 - janus::exp(-delta_v / Ve));
}

template <typename Scalar>
Scalar mass_flow_rate(const Scalar &thrust, const Scalar &Ve) {
    return thrust / Ve;
}

template <typename Scalar>
Scalar burn_time(const Scalar &propellant_mass, const Scalar &mdot) {
    return propellant_mass / mdot;
}
 
} // namespace vulcan::propulsion::rocket