Imagine you have an oil pump in your car that has its outlet blocked. The pump is trying to throw the oil out but since the outlet is blocked the pressure in the pump keeps increasing. The excessive pressure that develops in the pump can be catastrophic to its strength and therefore life. This is precisely what happens when you try to operate the pump under extreme cold conditions, when the viscosity of the lubricant increases so much that the pump almost behaves as if its outlet has been blocked.
This is a very common design scenario for pump manufacturers. Estimation of what is called as “shut-off” pressure and its implications on the structural integrity of the pump are key concepts that every pump manufacturer should bear in mind while designing pumps. Interestingly, simulations today allow manufacturers to develop deep understanding of such phenomenon and help them to design pumps, that perhaps they could not have, with just physical testing and prototyping. Continue reading →
At ANSYS, we are continually improving our turbomachinery simulation capabilities. Some recent improvements are proving useful to engine manufacturers, enabling them to better understand the on-wing performance of their new fuel-efficient engines.
Fans in modern aircraft engines are very important in that they provide most of the thrust required by the aircraft. Their environment is very challenging though as they are frequently subjected to non-uniform inflow conditions. These conditions could be either due to flight operating requirements such as take-off and landing, the engine nacelle installation configuration, wake interference from aircraft fuselage or cross-flow wind conditions. Similarly, industrial land-based gas turbines in power plants can be subjected to inlet flow distortion due to upstream ducting or installation maintenance deterioration. Continue reading →
Our Tech Tips for reliable turbomachinery blade development looks a little different this month because (unbeknownst to me) our IT department is moving some equipment this weekend, and well, I didn’t want you to miss out, so we’re cross-publishing this one on turbomachinery here on the blog!
Turbomachinery Blade Development with Aero-Mechanical Simulation
Engineers need advanced simulation tools to enable them to meet customer demands for more-efficient and reliable high-performance machines. Engineers must accurately predict aerodynamic performance across an increasingly wide range of speeds and operating conditions, and they also must guarantee reliability in the design. For example, they need to ensure that blade vibration will be damped across the operating range and that cyclic unsteady loading will not impact design life. Continue reading →
Turbomachinery — turbochargers, compressors, jet engines, gas turbines, pumps, etc.— are subjected to some of the harshest environments for an engineered product. High rotational velocities and extreme temperatures and pressures produce high static stresses. Couple on top of that the vibrations encountered due to the fluctuating and turbulent flow field, rotating turbomachinery components are primed for high-cycle fatigue (HCF) failures.
Traditionally, cyclic modal analyses are used to extract the vibrational modes and the appropriate modes from Campbell and interference diagram assessments are scaled based on past test data to arrive at estimates of the vibratory stresses for a fatigue analysis. Continue reading →
It’s official: Reaction Design has merged with ANSYS.
These are exciting times for both companies and for our industry. By joining forces, we are able to provide our customers with the most powerful and effective combustion simulation tools available in the world.
Let me introduce myself and Reaction Design. I am the CEO of Reaction Design, and for over 15 years, our company has created solutions that automate the analysis of chemical processes through computer simulation and modeling. We serve more than 400 customers from around the globe, including industry-leading internal combustion engine, industrial and aviation turbine manufacturers, materials processors and energy producers. Continue reading →
ANSYS AdvantageVolume VII Issue 3 is now available, and I am pleased to announce that the spotlight is on my area, turbomachinery (some call it rotating machinery). My industry colleagues at ANSYS and I contributed several overview articles that, I hope, explain the work we are doing to empower developers to design and build better, more energy efficient turbomachinery.
Of great interest to me are the customer contributions — for a number of reasons, including historical ones. I have worked in the business for so many years, and it is really gratifying to see how far the software and customers’ applications have advanced. The positive impact on new machinery development is amazing as well. Continue reading →
PCA Engineers (www.pcaeng.co.uk) is offering a free Vista CCD app for Android phones. Last year PCA made Vista CCD available as an app for iPhones. Of course, this is the same Vista CCD that is part of the ANSYS BladeModeler toolset used in centrifugal compressor design .
Recently, I talked with Chris Robinson from PCA to find out more about the motivation for making Vista CCD into a mobile app — as well as to find out how much interest it has garnered. Continue reading →
Well, it’s that time of year again. The ASME Turbo Expo (sponsored by the International Gas Turbine Institute, or IGTI) is right around the corner. For 20 of the past 23 years, this has meant a travel week for me, and this year it is to Copenhagen, Denmark, June 11 to 15. As turbomachinery is an important part of our business, ANSYS is a Silver Sponsor and strong participant in the event. And justifiably so. The ASME Turbo Expo is the premiere event for turbomachinery, bringing together the best and brightest from leading turbomachinery companies around the world. The draw is that the papers are generally of a high caliber, resulting from a peer review process that is generally only used for journal-quality publications. All the industry leaders are there, and the exposition is high quality and industry specific. Continue reading →