(actually the comments provide an answer to your question, but this is additional information).
This is a link to a free software called as QBlade. It is a wind turbine design and optimization software with emphasis on blade design (using XFOIL). This might come useful in designing/ optimization the rotor blades.
What can it be used for? :-
In designing and optimizing horizontal, vertical axis turbines. Design of turbine blades. (mainly aerodynamics)
This is a link to a report titled 'free software on wind turbine modelling'. This is written in python, and mainly combines various free codes/softwares. It uses MBDyn for simulation of structural mechanics of turbine. It uses unsteady BEM for aerodynamic loads simulation.
Why should it be useful? :-
This report discusses about python scripting and python integration with other free softwares, which as per the question is a desirable feature.
This is a link to windenergytk, a compilation of software tools aimed towards full design and development of entire wind-turbine project. The modules include analysis, synthesis, aerodynamics, vibrations, electrodynamics and system performance.
Why have I suggested this? :- Although this code is aimed towards designing of the conventional turbines, it has different modules covering different aspects, So you can (I think) use one / several of them for specialized tasks, and integrate them with your code. In short, you might derive chunks of code from this which can then be used to do some of your tasks.
This is a link to a report titled 'OPTIMIZATION OF A WIND TURBINE ROTOR WITH VARIABLE AIRFOIL SHAPE VIA A GENETIC ALGORITHM'. And discusses the optimization procedure and consequences of the blade shape of a rotor.
Purpose of including this link:- In order to develop unconventional rotors, you might have to do lot of optimization in shape of rotor blades, so this reference can be referred to see how it is done in case of conventional turbines, and may possibly be extended to unconventional designs. (I have not done this work, but I thought somebody might find this useful).
This is a link to the software called Wind sim suite. It also uses MBDyn. Two models are included for simulations,
a) 2 bladed Control Advanced Research Turbine (CART)
b) 3 Blades 5 MW National Renewable Energy Laboratory (NREL) turbine.
Why this link? :- There is extensive documentation and case studies available. The software is written in python.
Following link is not really a software, but shows some unconventional wind turbine designs,
IMO, design and development of a novel design is an iterative process, and one might have to use conventional CFD / FEA tools to do so (packages like OpenFAOM, or commercial softwares like Fluent, ANSYS etc). If it is a very new design / concept, then only simulations are not sufficient and one might have to carry out some experimentation.
all the best