Research on Boundary Layer Ingestion effects of distributed propulsion configuration

2014 ◽  
Author(s):  
Wenwen Kang ◽  
Jing Zhang ◽  
Lingyu Yang
Keyword(s):  
Boundary Layer ◽  
Distributed Propulsion

Aerodynamic benefits of boundary layer ingestion for distributed propulsion configuration

2019 ◽  
Vol 91 (10) ◽  
pp. 1285-1294 ◽  
Author(s):  
Jing Zhang ◽  
Wenwen Kang ◽  
Lingyu Yang
Keyword(s):  
Boundary Layer ◽  
Reference Value ◽  
Aerodynamic Characteristics ◽  
Comprehensive Analysis ◽  
Propulsion System ◽  
Analysis Method ◽  
Content Type ◽  
Model Based ◽  
Distributed Propulsion ◽  
Lift And Drag

Purpose Boundary layer ingestion (BLI) is one of the probable noteworthy features of distributed propulsion configuration (DPC). Because of BLI, strong coupling effects are generated between the aerodynamics and propulsion system of aircraft, leading to the specific lift and drag aerodynamic characteristics. This paper aims to propose a model-based comprehensive analysis method to investigate this unique aerodynamic. Design/methodology/approach To investigate this unique aerodynamics, a model-based comprehensive analysis method is proposed. This method uses a detailed mathematical model of the distributed propulsion system to provide the essential boundary conditions and guarantee the accuracy of calculation results. Then a synthetic three-dimensional computational model is developed to analyze the effects of BLI on the lift and drag aerodynamic characteristics. Findings Subsequently, detailed computational analyses are conducted at different flight states, and the regularities under various flight altitudes and velocities are revealed. Computational results demonstrate that BLI can improve the lift to drag ratio evidently and enable a great performance potentiality. Practical implications The general analysis method and useful regularities have reference value to DPC aircraft and other similar aircrafts. Originality/value This paper proposed a DPS model-based comprehensive analysis method of BLI benefit on aerodynamics for DPC aircraft, and the unique aerodynamics of this new configuration under various flight altitudes and velocities was revealed.

scholarly journals Methodology for the Assessment of Distributed Propulsion Configurations with Boundary Layer Ingestion Using the Discretized Miller Approach

2017 ◽  
Vol 10 (3) ◽  
pp. 174 ◽  
Author(s):  
Esteban Valencia ◽  
Chengyuan Liu ◽  
Devaiah Nalianda ◽  
Laskaridis Panagiotis ◽  
Iain Gray ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Distributed Propulsion

Turboelectric Distributed Propulsion Modelling Accounting for Fan Boundary Layer Ingestion and Inlet Distortion

2020 ◽  
Author(s):  
Georgios Athanasakos ◽  
Nikolaos Aretakis ◽  
Alexios Alexiou ◽  
Konstantinos Mathioudakis
Keyword(s):  
Boundary Layer ◽  
Parametric Design ◽  
Pressure Ratio ◽  
System Level ◽  
Design Point ◽  
Engine Model ◽  
Inlet Distortion ◽  
Distributed Propulsion ◽  
Inlet Conditions ◽  
The Impact

Abstract A modelling approach of Boundary Layer Ingesting (BLI) propulsion systems is presented. Initially, a distorted compressor model is created utilizing the parallel compressor theory to estimate the impact of inlet distortion on fan performance. Next, a BLI propulsor model is developed considering both distortion effects and reduced inlet momentum drag caused from boundary layer ingestion. Finally, a Turbo-electric Distributed Propulsion (TeDP) model is set up, consisting of the BLI propulsor model, the associated turboshaft engine model and a representation of the relevant electrical system. Each model is validated through comparison with numerical and/or experimental data. A design point calculation is carried out initially to establish propulsor key dimensions for a specified number of propulsors and assuming common inlet conditions. Parametric design point analyses are then carried out to study the influence of propulsors number and location under different inlet conditions, by varying fan design pressure ratio between 1.15 and 1.5. BLI and non BLI configurations are compared at propulsion system level to assess the BLI benefits. The results show that maximum BLI gains of 9.3% in TSFC and 4.7% in propulsive efficiency can be achieved with 16 propulsors and FPR = 1.5, compared to podded propulsors, while further benefits can be achieved by moving the propulsor array backwards in the airframe.

Model-based analysis of boundary layer ingestion effect on lateral-directional aerodynamics using differentiated boundary conditions

2016 ◽  
Vol 231 (13) ◽  
pp. 2452-2463
Author(s):  
Jing Zhang ◽  
Xianfa Zeng ◽  
Lingyu Yang
Keyword(s):  
Boundary Layer ◽  
Boundary Conditions ◽  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
Propulsion System ◽  
Computational Method ◽  
Body Type ◽  
Detailed Model ◽  
Model Based ◽  
Distributed Propulsion

The noteworthy feature of aircraft with distributed propulsion configuration is the integration of a blended-wing-body type airframe and an embedded distributed propulsion system, thus inducing the specific boundary layer ingestion effect. Different boundary layer ingestion effects on the distributed engines may generate asymmetric flow fields on the airframe surface, and then lead to the unique lateral-directional aero-propulsive close coupling. To investigate the lateral-directional aerodynamics influenced by boundary layer ingestion, a new comprehensive computational method based on the differentiated boundary conditions is proposed. This method uses a synthetic three-dimensional computational model including the airframe and multi-engine to analyze the aerodynamic characteristics, and the essential boundary conditions can be extracted from the thermodynamic distributed propulsion system model to represent the different boundary layer ingestion intensities on the left and right engines. Subsequently, detailed model-based analyses of boundary layer ingestion influences on the lateral-directional aerodynamic characteristics are conducted, and the influence regularities under different flight states are revealed. All the results demonstrate that the differentiated boundary layer ingestion intensities on distributed engines can certainly affect the roll and yaw aerodynamic performance of the distributed propulsion configuration aircraft.

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