turboshaft.py

class openconcept.propulsion.turboshaft.SimpleTurboshaft(**kwargs)

Bases: ExplicitComponent

A simple turboshaft which generates shaft power consumes fuel.

This model assumes constant power specific fuel consumption (PSFC).

Inputs:

  • shaft_power_rating (float) – Rated power of the turboshaft (scalar, W)

  • throttle (float) – Engine throttle. Controls power and fuel flow. Produces 100% of rated power at throttle = 1. Should be in range 0 to 1 or slightly above 1. (vector, dimensionless)

Outputs:

  • shaft_power_out (float) – Shaft power produced by the engine (vector, W)

  • fuel_flow (float) – Fuel flow consumed (vector, kg/s)

  • component_cost (float) – Nonrecurring cost of the component (scalar, USD)

  • component_weight (float) – Weight of the component (scalar, kg)

  • component_sizing_margin (float) – Equal to 1 when producing full rated power (vector, dimensionless)

Options:

  • num_nodes (int) – Number of analysis points to run (sets vec length; default 1)

  • psfc (float) – Power specific fuel consumption. (default 0.6*1.69e-7 kg/W/s) Conversion from lb/hp/hr to kg/W/s is 1.69e-7

  • weight_inc (float) – Weight per unit rated power Override this with a reasonable value for your power class (default 0, kg/W)

  • weight_base (float) – Base weight This is a bad assumption for most turboshafts (default 0, kg)

  • cost_inc (float) – Nonrecurring cost per unit power (default 1.04, USD/W)

  • cost_base (float) – Base cost (default 0 USD)