What Is Pogo and Why Is It Bad For Rockets?

by Kerry Oliphant on Jun 28, 2018 5:21:25 PM

Space launch vehicles can exhibit self-excited longitudinal oscillations, also known as “Pogo” — so named because the phenomenon vibrates the rocket up and down in a manner similar to bouncing on a pogo stick. The vibrations severely impair the astronauts’ ability to pilot or respond to emergencies and can cause structural failure of the vehicle. NASA first became aware of the disastrous consequences from Pogo during the Gemini-Titan program. The issue continued to plague the agency through the Saturn V Moon launch missions.

An Initial Look at Conical Diffusers in Turbomachinery Design

by Jamin Bitter on Jun 22, 2018 12:01:00 AM

Perhaps the most common type of diffuser in turbomachinery is the conical diffuser. This diffuser is found at the exit of every volute as the geometry transitions to the exit flange. This conical diffuser must be sized appropriately to maximize machine performance across the desired flow range and can have a large impact on the end footprint and performance of the turbomachine.

A Small Taste of Two Papers from Turbo Expo 2018 in Norway

by Barbara Shea on Jun 14, 2018 11:15:18 AM

The 2018 ASME Turbo Expo in Lillestrøm, Norway was, as always,  a smorgasbord of papers and presentations on the latest and greatest ideas in turbomachinery and gas turbines. Two of our favorites were from Mark R. Anderson and Felipe F. Favaretto, Concepts NREC employees. Coincidence? I think not. Felipe presented, “Development of a Meanline Model for Preliminary Design of Recirculating Casing Treatment In Turbocharger Compressors”:

Online Versus In Person Training: The Pros and Cons

by Barbara Shea on Jun 8, 2018 12:01:00 AM

Ongoing education is a reality for most professionals. The training requirements are usually set by employers or professional associations with the goal of keeping employees and members up to date with the latest technologies, theories, and/or tools available in the industry. Numerous disciplines require Continuing Education Units (CEUs) to maintain certifications, including engineers, educators, nurses, and many others. Increasingly, employers are specifying a professional development goal as part of their employee’s yearly review. Those reviews impact your continued employment, your salary and your career path.

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