Automotive Turbocharger

Turbocharged Internal Combustion (IC) Engine Model

Open the waste gate too slowly, or inject gases from an EGR too quickly, and the compressor will surge, overloading the intercooler with warmer air without a corresponding increase in pressure (not to mention noise).  Open the waste gate too quickly, or fail to get exhaust gases to the turbine fast enough, and the boost lags and the compressor might even choke when it fails to meet a sudden engine demand.

And those are just some of the transient interactions between the turbocharger and the engine. Before you can get to that point, you have to first design a compressor, turbine, and intercooler that are well matched to the engine over a wide range of operating conditions, probably assuming perfect or instantaneous controls as a starting point.

Two sample FloCAD models were built to explore both

  • short time-scale events such as pressure waves within intake and exhaust runners (Detailed-level, applicable for valve or control system stability investigations), and
  • long time-scale events such as boost lag (System-level, including steady-state solutions for rapid sizing).

These models illustrate key program features and capabilities, but they may also be used as templates for other engine and compressor/turbine design studies.

A library of six turbine and five compressor designs was constructed as part of these models, and the development of those turbomachine designs is also summarized.

Click here to download this sample from our support forum

The development of this sample model spawned of another IC Engine sample model designed to explore fast‐transient interactions within an engine.

 

Chart of Turbocharger Shaft Speed Lagging a Transient Engine Acceleration

Turbocharger Shaft Speed Lagging a Transient Engine Acceleration

 

Chart of Waste-gate and Pop-off Valve Responses to the Engine Acceleration Event

Waste-gate and Pop-off Valve Responses to the Engine Acceleration Event

 

Parametric Sweeps of Net Torque on Turbocharger Shaft to Find Steady Operating Points

Parametric Sweeps of Net Torque on Turbocharger Shaft to Find Steady Operating Points.

 

Postprocessed Sinaps® Diagram showing Temperatures and Flows for Detailed Model

Postprocessed 2D-sketch Mode FloCAD® Diagram showing Temperatures and Flows for Detailed Model

 

Chart of Pressures in the Intake and Exhaust Systems During One cam shaft Revolution

Pressures in the Intake and Exhaust Systems (for Cylinder #1, 3000 rpm) During One cam shaft Revolution (TDC at left, center, and right of plot)

 

Advanced Pipes in FloCAD
Thursday November 14, 9-10am MT (8-9am PT, 11am-noon ET)
This webinar introduces advanced features for FloCAD pipes in addition to working with complex geometry. Complex geometry includes interior fins and surfaces for heat transfer, flow around enclosed objects, annular flow, concentric pipes, and more. FK Locators and TEEs as modeling objects will also be introduced.
Custom Heat Transfer and Pressure Drops
Tuesday November 19, 2-3pm MT (1-2pm PT, 4-5pm ET)
Do you know what the default assumptions are in FloCAD, and whether or not they apply in your situation? Do you know how far you can go past that starting point? The answer: pretty far. There are numerous mechanisms in FloCAD for adjusting factors, scaling uncertainties, and applying different or supplemental correlations. This webinar summarizes the options available to you to customize your flow models to make sure that they apply to each new situation you encounter.
Heat Exchangers: Detailed and System-level
Thursday November 21, 2-3pm MT (1-2pm PT, 4-5pm ET)
This is two webinars in one. The first explains the use and assumptions behind the FloCAD HX system-level modeling object. The second webinar describes detailed-level modeling of complex heat exchanger passages, including application of Compact Heat Exchanger (CHX) methods.
Starting in 2020, we will begin offering Introduction to Thermal Desktop and Introduction to RadCAD as either in-person training or online training, alternating between online and in-person every three months. The training uses lectures and demonstrations to introduce you to basic Thermal Desktop and RadCAD usage. Hands-on tutorials provide practice building models and interpreting results (tutorials are completed by students outside of the online class time).
 
The next training class will be an online format in January 2020:
  • Introduction to Thermal Desktop (and SINDA) - A three-part series on January 14, 16, and 21 from 9am to 12pm, Mountain time
  • Introduction to RadCAD - January 23 from 9am to 12pm, Mountain time
For up-to-date schedules, fees, and policies, visit our Product Training page. To register for the class above, complete our registration form and select "Online" for the Training Format.
 
If you are interested in product training for your company based on your schedule, please contact us to obtain a quote for training between 8-12 attendees. We can come to your facility or the lectures can be presented online. Descriptions of the available classes can be found in our course catalog.
 
To keep up with our training opportunities, take a look at our new Events and Training Calendar.