Study of the Transient Behavior of Turbocharged Diesel Engines Including Compressor Surging Using a Linearized Quasi-Steady Analysis

Abstract

The transient operation of turbocharged diesel engines during turbocharger compressor surging is investigated through simulation. This form of compressor dynamic instability can generate large amplitude compressor mass flow and pressure rise oscillations, sometimes leading even to flow reversals, and may also induce severe torsional loading to the turbocharger shaft. A model predicting the dynamic behavior of the engine aircharging system when compressor surging occurs was developed in conjunction with a linearized quasi-steady diesel engine simulation code. This analysis possesses the advantage over the more detailed engine codes of basic simplicity, speed of calculation and no need of many engine and turbocharger components parameters given as input data. Emphasis is given to the correct modeling of the physics of the phenomena concerned. Transient operation runs, including critical cases for surging initiation, were applied for two similar six-cylinder diesel engines. The first one is a Ruston & Hornsby engine for light duty automotive diesel applications, while the second one is a MWM marine duty diesel engine. By analyzing simulation results, the effect of the engine inlet manifold volume and the compressor air duct length on the phenomenon of surging is studied.

Exergy Analysis of Complex Ship Energy Systems

“…If ship specific (e.g., fishing vessels [4][5][6]) or equipment specific (e.g., diesel engines [7,8] or ballast water treatment system [9]) energy efficiency studies are quite common, the literature is still limited regarding more comprehensive and global approaches where the totality of the ship is taken into account [10].…”

Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

“…To this aim, the model is a true multi-cylinder one, solving separately and sequentially the algebraic and differential equations for each cylinder; friction is modelled with detailed per degree equations, whereas a fuel injection sub-model is incorporated in order to consider the transient fuel pump operation. The model has been used for an extensive parametric study [40] and sensitivity analysis [41,42], covering, among many other things, various governor configurations [36], while it was also extended to second-law analysis [43][44][45][46] and investigation of compressor surging [47] (the latter on a quasi-linear basis).…”

“…Diesel engine transient simulation when the compressor operates in the surge region has been studied rarely [47,[101][102][103][104][105][106][107]. In order to accomplish this task, representation of the compressor characteristics to the 5 The sequential turbocharging technique, i.e.…”

“…To obtain the unstable region of the compressor performance map, a simple method for estimating the complete compressor characteristics is usually adopted [47] that is based on the available steady region ones.…”

“…47,83]. Here, the ideal gas law and the first-law of thermodynamics are applied, taking into account the manifold volume and the heat loss from the (exhaust) manifold walls [3,4,68].…”