82 lines
4.1 KiB
C++
82 lines
4.1 KiB
C++
#pragma once
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#include "FluidSim/Fluid.hpp"
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#include <array>
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#include <cstdint>
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namespace fluidsim::port {
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// RHB31/VZ21-size mean-line approximation. Geometry, losses and coefficients
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// are estimates, not a digitized or validated manufacturer performance map.
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struct TurboConfig {
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static TurboConfig gt17(); // estimated Saab GT1752-size calibration
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double shaft_inertia{4e-6}; // kg m^2, compressor+turbine+shaft rigid rotor
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double compressor_radius{.018}, turbine_radius{.0135};
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double compressor_head_coefficient{.60}, compressor_efficiency{.65};
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double turbine_peak_efficiency{.65}, turbine_optimum_speed_ratio{.70};
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double compressor_effective_area{110e-6}, turbine_effective_area{100e-6};
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double bearing_viscous{1e-7}, windage{2e-11}; // Nm/(rad/s), Nm/(rad/s)^2
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// Estimated pressure-can/spring wastegate. Set maximum lift to zero for a
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// pure ungated turbo bench test. This changes bypass AREA, never boost.
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double gate_diaphragm_area{8e-4}, gate_spring_preload{40}, gate_spring_stiffness{6000};
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double gate_damping{120}, gate_diameter{.014}, gate_maximum_lift{.004};
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double reference_pressure{101325};
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float compressor_inlet_volume{20e-6f}, compressor_outlet_volume{30e-6f};
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float turbine_inlet_volume{30e-6f}, turbine_outlet_volume{20e-6f};
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std::array<float, 4> connection_diameters{.024f, .024f, .025f, .026f};
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};
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struct TurboSnapshot {
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double rpm{}, angle{}, shaft_energy{}, turbine_power{}, compressor_power{}, bearing_power{};
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double compressor_flow{}, turbine_flow{}, compressor_pressure_ratio{}, turbine_pressure_ratio{};
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double turbine_inlet_pressure{}, turbine_outlet_pressure{}, charge_pressure{}, charge_temperature{};
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double bearing_heat{}, energy_residual{};
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std::uint64_t limited_transfers{};
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double wastegate_flow{}, wastegate_lift{};
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};
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// Four pressure-storage nodes joined by turbine/nozzle and centrifugal-pump
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// characteristics. Existing pipe orifices exchange conserved mass/enthalpy.
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// The whole turbo is ONE solver component; do not also register its volumes.
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class Turbocharger final : public Component {
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public:
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explicit Turbocharger(TurboConfig config = {});
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const TurboConfig config;
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Volume0D compressor_inlet, compressor_outlet, turbine_inlet, turbine_outlet;
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Port& compressor_inlet_port;
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Port& compressor_outlet_port;
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Port& turbine_inlet_port;
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Port& turbine_outlet_port;
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void connect(BoundarySystem& boundaries, const std::vector<Pipe1D>& pipes,
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int compressor_in, bool compressor_in_left, int compressor_out, bool compressor_out_left,
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int turbine_in, bool turbine_in_left, int turbine_out, bool turbine_out_left);
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std::vector<Port*> ports() override;
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void update_state(float dt) override;
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TurboSnapshot snapshot() const;
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double omega() const { return omega_; }
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double shaft_energy() const { return .5*config.shaft_inertia*omega_*omega_; }
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double fluid_energy() const;
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// Intended for standalone initialization/tests, never an imposed running speed.
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void set_initial_rpm(double rpm);
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void set_wastegate_duty(double duty) { gate_duty_ = std::isfinite(duty) ? std::clamp(duty, 0., .85) : 0.; }
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private:
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std::array<Port*, 4> internal_;
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std::array<float, 4> connection_areas_{};
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double omega_{}, angle_{}, bearing_heat_{};
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double turbine_power_{}, compressor_power_{}, bearing_power_{}, energy_residual_{};
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double compressor_flow_{}, turbine_flow_{};
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double wastegate_flow_{}, wastegate_lift_{};
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std::uint64_t limited_transfers_{};
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bool connected_{};
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double gate_duty_{}; // pneumatic bleed fraction; zero restores spring boost
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static double nozzle(double upstream_pressure, double upstream_temperature,
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double downstream_pressure, double area);
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double transfer_flow(Volume0D& inlet, Volume0D& outlet, Port& inlet_external,
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Port& outlet_external, double requested, double dt);
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static void set_transfer(Volume0D& inlet, Volume0D& outlet, Port& inlet_internal,
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Port& outlet_internal, double flow, double shaft_work, double dt);
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};
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} // namespace fluidsim::port
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